1. From any page, press FIND. Using the ARROW KEYPAD, highlight the desired category from the list and press ENTER/MARK. 2. Press MENU. Highlight Near Other and press ENTER/MARK. If you are actively following a route, you may also choose Near Current Route, Near Next, or Near Destination. 3. Select a reference position on the map and press ENTER/MARK. The list changes to display items nearest to the new map position.
Naviad search result list

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To nd an item from another location through the Map Page:
1 From the Map Page, use the ARROW KEYPAD to pan to the desired location and press FIND. 2. Using the ARROW KEYPAD, highlight the desired category from the list and press ENTER/MARK. 3. Using the ARROW KEYPAD, highlight the desired item from the list and press ENTER/MARK. The items information page automatically opens, allowing you to save the item as a waypoint, show the item on the map, or automatically create a route (Go To) the item.

Finding an Item

Viewing the Information Page Each item listed in the Find Menu results list has an information page. The information page displays a variety of information about the map item. To view details about an item:
1. With the desired item highlighted in the search results list, press ENTER/MARK. An Information page appears with details about the item in a tabbed format. Depending on the type of item, additional options are available for viewing the item on the Map, viewing notes on a MapSource or BlueChart map, viewing a tide chart, viewing the list of maps on your data card, and viewing the next item in the search results list.

Exit Information Page

Using the Find From Feature The Find option also supports a nd from feature that allows you to center your search around an item which you have just found. For example, you search for Restricted Areas and the search shows an Anchoring Prohibited search result. If you press FIND again, you will see From Anchoring Prohibited as the new search from point. You may also use the Find feature to center your search from any waypoint, route list entry, map item or tide station. Highlight the item you want to Find from, and press the FIND key.

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Recently Found Items The Recently Found page displays a list of the items you have searched for or gone to recently. Press MENU to display the Options Menu for the Recently Found Items. Show Find History allows you to toggle between displaying the items you have searched for recently (Find History) and the items you have recently created a Go To for (Goto History). Remove Point removes the point that is highlighted in the list. Find Menu Options Menu To view additional options for the Find Menu, press the FIND key and then press MENU. The following options are displayed: Enable Auto Arrange automatically arranges the Find Menu. Disable Auto Arrange and Restore Default options appear when you select Enable Auto Arrange. Near Other allows you to select a new location from which to compile the Find items lists. Using the ARROW KEYPAD, move the map cursor to the desired location and press ENTER/MARK. Data Card Information shows information about the detailed map data stored on the data card, and allows you to select which maps are displayed or not displayed on the Map Page. Additional selections are included in the Options Menu when you are navigating: Near Next compiles the Find items lists based upon the next turn in the route. Near Destination compiles the Find items lists based upon the route destination. Near Current Route compiles the Find items lists based upon the active route.

To add via points to your route:
1. While navigating your route, press the NAV/MOB key. The Navigate menu opens. 2. Use the ARROW KEYPAD to select Edit Vias and press ENTER/MARK. 3. From the pop-up window, highlight either Use Map or Find and press ENTER/MARK. 4. If you selected Use Map, use the ARROW KEYPAD to select the desired item on the map and press ENTER/MARK. If you selected Find, select an item from the Find Menu as discussed in the Finding an Item section found previously in this manual. Remember you can press the MENU key while the Find Menu is open to nd an item near another location, such as the destination. 5. The new point is added to the route as displayed in the Add/Edit Vias Page. Continue steps 2 through 4 until you have added all of the vias that you want. Highlight Done and press ENTER/MARK to apply the new vias to the route.

Add/Edit Vias Page

showing a via point before the destination

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Creating a Route The Garmin GPSMAP 276C lets you create and store up to 50 reversible routes, with up to 300 waypoints each. Routes can be created in two ways. The rst way is to select waypoints from the Find Menu, allowing you to see a list of the route points as you create the route. The second way is by selecting waypoints or map items from the Map Page, allowing you to see each route point graphically on-screen as you create the route. To create a route using the Find Menu:
1. Press the MENU key twice to display the Main Menu page. 2. Use the ARROW KEYPAD to highlight Route from the vertical list of tabs. 3. Press the MENU key to display the Route Options Menu. Select New Route and press ENTER/ MARK. Or Highlight the rst available blank route slot and press ENTER/MARK. 4. The Route Review Page automatically opens, displaying a blank route. Press ENTER/MARK to nd items to add to the route. 5. The Find Menu opens. Using the methods discussed in the Finding an Item section of this manual, select waypoints and/or points of interest to add to your route. When the item information page is open, highlight OK and press ENTER/MARK to add the point to the route. Repeat until you have added all of the points to the route.

Creating a new route

Using Routes
Creating a new route on Route Review Page

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To create a route graphically:
1. Press the MENU key twice to display the Main Menu Page. Use the ARROW KEYPAD to highlight Route from the vertical list of tabs. 2. Press the MENU key to display the Route Options Menu. Select the New Route option and press ENTER/MARK. Or Highlight the rst blank slot in the Route List page and press ENTER/MARK. 3. On the Route Review Page, press the MENU key to open the Route Review Page Options Menu. 4. Use the ARROW KEYPAD to highlight Edit on Map and press ENTER/MARK. 5. Use the ARROW KEYPAD to highlight the desired map item and press ENTER/MARK. If you have selected an area of the map that is not a feature or waypoint, a new waypoint is created for that location. Press ENTER/MARK on the New Waypoint Page to save the location as a waypoint and continue adding points to your route. You can edit the properties of this waypoint as you can with any waypoint. Refer to the Using Waypoints section of this manual for more information. Repeat until you have added all points to the route. As you add each point to the route, the top of the map shows the waypoint/map item name, bearing and distance from your location, and coordinates of the cursor. The bottom of the map displays the number of available and used points. A route line appears on the map to indicate each completed leg, and a dotted line appears to indicate the distance and bearing from the last route waypoint to the map pointer location. 6. When nished press QUIT twice to return to the Route Review Page. Or, press MENU, highlight Edit as Text and press ENTER/MARK to view the Route Review Page.

To turn proximity alarms on or off:

Proximity tab

1. From the Proximity tab of the Points Tab, use the ARROW KEYPAD to highlight the eld below Proximity Alarm and press ENTER/MARK. 2. Select the desired ON or OFF setting and press ENTER/MARK.
To add a proximity waypoint:
1. From the Proximity tab of the Points Tab, use the ARROW KEYPAD to highlight an empty line on the Proximity List and press ENTER/MARK. The Find screen appears. 2. Select the desired waypoint or point of interest from the Find screen. With OK highlighted, press ENTER/MARK to select that point. (For complete information about selecting waypoints or points of interest from the Find screen, see Finding an Item.) 3. The distance eld is now highlighted. Press ENTER/MARK to begin entry of the proximity radius. 4. Use the ARROW KEYPAD to enter a distance value (up to 99.99 units) and press ENTER/MARK.

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The following options are available by pressing MENU on the Proximity tab of the Points Tab: Remove Point removes selected waypoint from the proximity list. Remove All removes all waypoints from the proximity list. To clear one or all proximity waypoint(s) from the list:
1. Open the Proximity tab of the Points Tab. 2. Use the ARROW KEYPAD to highlight the proximity waypoint to clear and press MENU. 3. To clear a single alarm, highlight the Remove Point option and press ENTER/MARK. To clear all proximity waypoints, select the Remove All option and press ENTER/MARK. 4. Use the ARROW KEYPAD to highlight the OK prompt and press ENTER/MARK to conrm.

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Main Pages Map Page

Water Navaids Land Data Fields

Current Location

Map Scale
shown with optional BlueChart data
Using the Map Page The Map Page provides a comprehensive display of electronic cartography, plotting, and navigational data. When using the unit with optional MapSource BlueChart data (in Marine Mode), the map display shows your location on a digital chart, complete with geographic names, map items, navaids and a host of other chart features. In Automotive Mode, more detailed map features are available with other optional MapSource data, such as City Select. The Map Page also plots your track and displays any routes and waypoints you create. An on-screen cursor lets you pan and scroll to other map areas, determine the distance and bearing to a position, and perform various route and waypoint functions. Two basic map operating modes, position mode and cursor mode, determine what cartography is shown on the map display. Position mode pans the cartography to keep the present position marker within the display area. The position marker is the black triangle vehicle icon that shows your travel on the Map Page. The GPSMAP 276C always powers up in the position mode, with the last known location centered on the map display. The GPSMAP 276C enters cursor mode when the ARROW KEYPAD is pressed. Cursor mode pans the cartography to keep the cursor within the display area. The cursor is the white pointer arrow icon used for panning around the Map Page. When the cursor is active, an additional data window appears at the top of the screen to indicate the position, range, and bearing to the cursor or a selected waypoint or map item.

In some cases, additional information tabs appear at the top of the Information page or Waypoint Review Page. If desired, use the ARROW KEYPAD to highlight the extra tabs and view the information.

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Selecting Map Scales and Additional Maps The map display has 28 available range scales from 20 ft. to 800 nm. (20 ft. to 800 mi or 5 m to 1200 km). The map scale is controlled by the IN and OUT keys, with the current scale displayed at the bottom right of the data window. To select a map scale (zoom in and out):
Press the OUT key to zoom out Press the IN key to zoom in

Using Built-in Basemap

The system has a built-in worldwide database to 20 mi, with more detailed coverage available through the use of the optional BlueChart or MapSource data. The GPSMAP 276C displays cartography as long as there is chart information available for the range you have selected. Map coverage conforms to the following conditions: Cartography is displayed when the selected zoom range is covered by either the internal basemap, BlueChart, or other MapSource data. When the selected zoom range is covered by both the internal database and BlueChart/ MapSource data, the cartography with the best resolution is displayed. When the selected zoom range exceeds the resolution of the data in use, an overzoom warning appears below the map scale. When MapSource data is displayed, a map card label appears below the map scale.

Using Map Card Data

Overzoom: No additional data available
NOTE: The scale value represents the distance from one end of the scale bar to the other.

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Map Page Options Menu The Options Menu on the Map Page provides access to functions and features of the Map Page, as well as layout options for the page. The data window, located at the right side of the display, provides a user-selectable layout of various types of useful data. Each data eld may be congured to display any one of several data options. The data window layout may also be customized to change the actual size of the data displayed. To display the Map Page Options Menu:
1. Press PAGE repeatedly until the Map Page is displayed. 2. Press MENU.
Map Page Options Menu (Marine Mode)

Measure Distance

The available options described below. In the sections following, some options, such as Measure Distance, also have instructions detailing how to use the option. The Options Menu varies slightly between the Marine Mode and Automotive Mode. Declutter On/Off toggles between showing spot soundings and map outlines for easier viewing. Measure Distance allows you to measure the bearing/distance between two points on the map. Show/Hide Heading Line (Marine Mode only) toggles between showing or hiding the Heading Line, which projects from the current position (triangle vehicle icon) to show your current heading. Show/Hide Directions (Automotive Mode only) toggles between showing or hiding the directions eld at the top of the Map Page display. Hiding the directions enables more of the map to be visible. Set Up Map jumps to the Map Setup Menu, allowing you to congure the map display to your preferences, including map detail, map orientation, automatic zoom, and various map items and points. For detailed information on the Map Setup Menu, refer to the Map Page Setup Menu section later in this manual. Set Up Page Layout allows you to choose the size of text and number of data elds.

Data Card Information Page
6. To select/deselect individual maps for display on the Map Page, highlight the box next to the desired map, and press ENTER/MARK to check/uncheck the Show box. Or Press MENU and select one of the options (Show All, Hide All, or Show Defaults), and press ENTER/MARK. 7. Press QUIT to exit the Data Card Information page.
Information page for an individual map
Map Family Information Page

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Map Page Setup Menu The Map Page Setup Menu uses a le tab system, making it easier for you to nd the various settings for conguring the map display. The following table outlines the le tab names and the settings available in each tab: General Detail, Orientation, Auto Zoom, Lock to Roads, Accuracy Circle Map Basemap, Map Outlines, Lat/Lon Grid Line Heading Line, Bearing Line, Course Line, Track Log, Saved Tracks Waypoint Waypoints, Active Route Marine Services/Facilities, Spot Soundings, Tide Stations, Night Colors Navaids Symbol Set, Symbol Size, Light Sectors City Large City, Medium City, Small City, Small Town Road Freeway, Highway, Local Road, Local Road Name, Railroad Point POIs, Geo, Exit Area River/Lake, Park, Other, Metro Topo Major Contour, Inter Contour, Minor Contour, Land Cover To change a map setup feature:
1. From the Map Page, press MENU, highlight Set Up Map and press ENTER/MARK. 2. Press LEFT or RIGHT on the ARROW KEYPAD to highlight the desired le tab, then UP or DOWN on the ARROW KEYPAD to highlight to the eld you want to change and press ENTER/MARK. 3. Press UP or DOWN on the ARROW KEYPAD to highlight to the desired setting and press ENTER/ MARK to select the new setting. 4. Press QUIT to exit.

Map Page Setup Menu

Map Page Options (Marine Mode)

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General tab Detail Most, More, Normal, Less, Least: controls how much map detail is displayed. This setting only applies to any map feature set to Auto. Those features that have a specied scale or that are turned Off are unaffected by this setting. AutoZoom On/Off: when On, the map automatically adjusts the map scale to a lower scale as you approach your destination point. Lock to Roads On/Off: When On, if the vehicles position is close enough to a road, the Map Page displays the current position icon as locked to the road. Accuracy Circle On/Off: When On, the circle represents the approximate accuracy of the unit based on EPE, DOP, and basemap quality. Your current position is displayed within the circle. Orientation North Up: xes the top of the map display to a north heading. Track Up: xes the top of the map display to the current track heading. Course Up: xes the map so the direction of navigation is always up and turns the navigation leg line vertical on the screen. Map tab Basemap On/Off: turns the built in basemap on or off. Map Outlines On/Off: turns outlines of data card maps on or off. Lat/Lon Grid Off, Auto, 20 ft. to 800 nm/mi: sets the maximum scale at which the Lat/Lon grid appears on the screen. Some types of data are only displayed to certain zoom scales. Grid Labels Off, Auto, 20 ft. to 800 nm/mi: sets the maximum scale at which the grid labels appear on the screen. Some types of data are only displayed to certain zoom scales.

Marine Tab of Map Page Setup Menu
Mrn Nav Tab of Map Page Setup Menu

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Road tab Freeway, Highway, Local Road, Local Road Name, Railroad controls the text size and zoom scale for roads. Text Off, Small, Medium, and Large: controls the screen size of the name. Zoom Auto, Off, 20 ft. to 800 nm/mi: sets the maximum scale at which the roads appear on the screen. Some types of data are only displayed to certain zoom scales. Point tab POIs, Geo, Exit controls the text size and zoom scale for points, such as exits. Text Off, Small, Medium, and Large: controls the screen size of the name. Zoom Auto, Off, 20 ft. to 800 nm/mi: sets the maximum scale at which the points appear on the screen. Some types of data are only displayed to certain zoom scales. Area tab River/Lake, Park, Other, Metro controls the text size and zoom scale for areas such as rivers. Text Off, Small, Medium, and Large: controls the screen size of the name. Zoom Auto, Off, 20 ft. to 800 mi: sets the maximum scale at which the areas appears on the screen. Some types of data are only displayed to certain zoom scales. Topo tab Major Contour, Inter Contour, Minor Contour, Land Cover controls the text size and zoom scale for topographic contours. Text Off, Small, Medium, and Large: controls the screen size of the name. Zoom Auto, Off, 20 ft. to 800 nm/mi: sets the maximum scale at which the contours appear on the screen. Some types of data are only displayed to certain zoom scales.
Road Tab of Map Page Setup Menu
Topo Tab of Map Page Setup Menu

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Main Pages Compass Page

Using the Compass Page The Compass Page is standard in Marine Mode and optional in Automotive Mode. During active navigation, the Compass Page guides you to your destination with digital data eld readouts and a graphic compass display with a bearing pointer. To show the Compass Page in Automotive Mode:
1. While in Automotive Mode, press MENU twice to display the Main Menu. 2. Use the ARROW KEYPAD to highlight the Display Tab. 3. Highlight the Compass Page eld and press ENTER/MARK. Select On and press ENTER/MARK.
The middle of the page features a rotating compass ring that shows your course over ground (track) while you are moving. Your present course over ground is indicated at the top of the compass ring. The direction of the destination (bearing) relative to the course over ground is indicated by a bearing pointer in the middle of the compass ring and a bearing bug on the outside of the compass ring (Note: the bearing bug is a feature of Marine mode only). The compass ring and bearing indicators work independently to show, at a glance, the direction of your movement and the direction to your destination. For instance, if the arrow points up, you are going directly to the waypoint. If the arrow points any direction other than up, turn toward the arrow until it points up, then continue in that direction.

Page tabs

Main Menu: GPS Tab
The Main Menu pages, listed below, are discussed in-depth in the following pages. GPS shows satellite status, accuracy, DOP, and differential information. Route allows you to create, edit, activate, or delete routes. Points allows you to create, edit, or delete waypoints and proximity points. Track allows you to save the active track, edit saved tracks, and navigate a TracBack. Alarms sets up alarms for navigation (such as anchor drag), the system (such as accuracy), and the sonar features (such as shallow water). Celestial displays tide information, sun and moon information, and hunting and shing information. Message displays system messages, such as Lost Satellite Reception. You can also lter the messages that are displayed. Display adjusts various aspects of the display, such as backlight timeout and intensity. Sound sets the volume level, voice language, attention tone, and beeper action. Setup provides several tabs to setup the GPSMAP 276C to suit your needs.

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Main Menu
Using the GPS Tab The GPS Tab provides a visual reference of satellite acquisition, receiver status, and accuracy. The status information show what the receiver is doing at any given moment. The skyview and signal strength bars give an indication of what satellites are visible to the receiver and whether they are being tracked. The signal strength is shown on a bar graph for each satellite, with the satellite number below. As the receiver locks onto satellites, a signal strength bar appears for each satellite in view, with the appropriate satellite number underneath each bar. The progress of satellite acquisition is shown in three stages: No signal strength bars: The receiver is looking for the satellites indicated. White signal strength bars: The receiver has found the satellite(s) and is collecting data. Green signal strength bars: The receiver has collected the necessary data and the satellite(s) are ready for use. As soon as the GPSMAP 276C has collected the necessary data from the best satellites in view to calculate a x, the status eld indicates the status. The unit then updates the position, date and time. You can use the skyview to help determine if any satellites are being blocked, and whether you have a current position x (indicated by a 2D, 2D Differential, 3D, or 3D Differential in the status eld). The skyview shows a birds-eye view of the position of each satellite relative to the receivers last known position. The outer circle represents the horizon (north up), the inner circle 45 above the horizon, and the center point a position directly overhead. You can also set the skyview to a Track Up conguration, causing the top of the skyview to align along your current track heading. The GPS Tab also displays the current date and time near the bottom of the page. A power source indicator shows the battery level ( ), shows that the unit is charging ( ), or shows that an external power source is in use ( ).

GPS Tab

Skyview Signal Strength Bars Status Field Satellite Numbers

Current Date

Power Source Indicator

Current Time

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Main Menu GPS Tab
Signal Strength Bars Receiver Status Field Satellite Numbers

Differential Status

Accuracy Field
Receiver Status The Receiver Status eld, located at the top eld of the page, displays one of the following conditions: Searching the Sky: The receiver is looking for any satellites. AutoLocate: The receiver is looking for any satellite whose almanac has been collected. This process can take up to ve minutes. Acquiring Satellites: The receiver is looking for and collecting data from satellites visible at its last known or initialized position, but has not collected enough data to calculate a x. 2D GPS Location: At least three satellites with good geometry have been acquired and a 2 dimensional position x (latitude and longitude) is being calculated. 2D Differential will appear when you are receiving DGPS corrections in 2D mode and a D will show on the strength bar of satellites being corrected. 3D GPS Location: At least four satellites with good geometry have been acquired and your position is now being calculated in latitude, longitude and altitude. 3D Differential will appear when you are receiving DGPS corrections in 3D mode and a D will show on the strength bar of satellites being corrected. Lost Satellite Reception: The receiver is no longer tracking enough satellites for a 2D or 3D x. Receiver Not Usable: The receiver is unusable, possibly due to interference or abnormal satellite conditions. Turn the unit off and back on to reset. Simulating GPS: The receiver is in simulator mode. GPS Off: The GPS receiver is turned off.

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Differential Field Differential receiver status is indicated in the bottom left eld of the page and will show one of the following conditions: None: No optional beacon receiver is attached or enabled in the Comm tab (Main Menu) or WAAS is turned Off. Searching for WAAS: WAAS is enabled and the receiver is searching for WAAS signal. Using WAAS: WAAS capability is enabled and the unit is receiving WAAS corrections. Check Beacon Wiring: The DGPS setting is enabled in the Comm tab (Main Menu) but no DGPS device is detected. No Beacon Signal: DGPS receiver is attached, but not transmitting RTCM data to GPS. Tuning Beacon: Receiver is tuning manual DGPS frequency. Using Differential: Unit is receiving DGPS corrections. Scanning for Beacon: DGPS receiver is scanning for available frequency.

1. Press MENU twice to open the Main Menu. 2. Highlight Track from the vertical list of tabs using the ARROW KEYPAD.

Track Tab: Active tab

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Active tab The Active tab allows you to save and clear the track log as well as set up how the unit records tracks. Record Mode Wrap records over the oldest tracks when the track log reaches 100%. Fill records a track log until the track log is full (100%). Off does not record tracks. Interval Distance creates track points after a specied distance has been traveled. Time creates track points after a specied time has elapsed. Resolution creates track points based upon the resolution. The higher the resolution entered, the more points the unit creates to make the track. Value creates a track according to the Interval and Value. Enter a specic distance, time, or resolution.

To clear the track log:

1. Press MENU twice to display the Main Menu. 2. Using the ARROW KEYPAD, highlight Track, then highlight the Active tab to the right. 3. Use the ARROW KEYPAD to select the Clear button and press ENTER/MARK. 4. Highlight the OK eld and press ENTER/MARK. Press QUIT to exit.
Saving a portion of the track log

Track Tab

1. Press the MENU key twice to open the Main Menu. 2. Use the ARROW KEYPAD to highlight Track, then highlight the Active tab to the right. 3. Use the ARROW KEYPAD to select Save and press ENTER/MARK. 4. A window pops up asking if you want to save the entire track log. To save the entire track, highlight Yes and press ENTER/MARK.

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To save a portion of the track log:
1. Press the MENU key twice to open the Main Menu. 2. Use the ARROW KEYPAD to highlight the Track Tab, then highlight the Active tab to the right. 3. Use the ARROW KEYPAD to select Save and press ENTER/MARK. 4. A window pops up asking if you want to save the entire track log. To save only a portion of the track, highlight No and press ENTER/MARK. 5. Use the ARROW KEYPAD to select a beginning point and press ENTER/MARK. Use the ARROW KEYPAD to select an ending point and press ENTER/MARK. 6. The Track Review Page automatically opens. To change the name of the track, highlight the name eld and press ENTER/MARK, make your changes and press ENTER/MARK again. To delete the track on the map, highlight Delete and press ENTER/MARK.

COM 1 tab of the Setup Tab

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If GARMIN DGPS or RTCM In/NMEA Out format is selected, additional elds are provided to control a Garmin differential beacon receiver directly from your GPSMAP 276C. You may have the unit automatically scan for the DGPS beacon signal or you can enter the beacon frequency and bit rate on the unit and the information will be used to tune the beacon receiver. To have the unit automatically scan for a frequency:
1. With the unit set to GARMIN DGPS or RTCM In/NMEA Out, use the ARROW KEYPAD to highlight the Beacon eld and press ENTER/MARK. 2. Highlight Scan and press ENTER/MARK. The numbers in the Frequency eld change as the unit scans from 284 kHz to 325 kHz, 200 bit rate, then 100, at 6-second intervals.

To restart the scan:

1. Press MENU. 2. Highlight Restart Scan and press ENTER/MARK.
To manually enter a frequency and bit rate:
1. With the unit set to GARMIN DGPS or RTCM In/NMEA Out, use the ARROW KEYPAD to highlight the Beacon eld and press ENTER/MARK. 2. Highlight User and press ENTER/MARK. 3. Highlight the Frequency or Bit Rate eld, press ENTER/MARK, then enter a frequency or bit rate and press ENTER/MARK when done.
COM 2 tab of the Setup Tab with GARMIN DGPS selected

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The Status eld displays one of the following: Tuning: Unit is attempting to tune to the specied frequency and bit rate. Scanning: Unit is automatically scanning through the frequencies and bit rates. Receiving: Unit is receiving DGPS signal and ready for operation. Check Wiring: Unit is not making connection with DGPS receiver. When the unit is receiving a DGPS signal, the SNR (Signal to Noise Ratio) and Distance elds will show data. The SNR range is 0dB to 30dB, with 30 being the best. The Distance may or may not show data, depending upon the signal being broadcast from the DGPS site. The DGPS beacon transmitters are operated by the U.S. Coast Guard (or similar government agency in other countries), which is responsible for their accuracy and maintenance. For DGPS transmitter problems or to nd the most updated list of frequencies and coverage areas, contact your local USCG, or see their Web site at http://www.navcen.uscg.mil/.

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SW Base Taiwan

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Appendix Time Offsets

The chart below gives an approximate UTC (Universal Time Coordinate) time offset for the various longitudinal zones. Check with local charts for more detailed information. If you are in daylight savings time, add one hour to the offset. Longitudinal Zone W180.0 to W172.5 W172.5 to W157.5 W157.5 to W142.5 W142.5 to W127.5 W127.5 to W112.5 W112.5 to W097.5 W097.5 to W082.5 W082.5 to W067.5 W067.5 to W052.5 W052.5 to W037.5 W037.5 to W022.5 W022.5 to W007.5 W007.5 to E007.5 Offset -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -Longitudinal Zone E007.5 to E022.5 E022.5 to E037.5 E037.5 to E052.5 E052.5 to E067.5 E067.5 to E082.5 E082.5 to E097.5 E097.5 to E112.5 E112.5 to E127.5 E127.5 to E142.5 E142.5 to E157.5 E157.5 to E172.5 E172.5 to E180.0 Offset 1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11 +12

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Approaching Turn: You are nearing a turn in a route. Arriving at Destination: You are nearing your destination. Batteries Low: The unit has less than 10 minutes of battery left. Cannot display all found, use city or postal code: The unit found too many items to display. Narrow the search using the city or postal code. Cant Unlock Maps: No applicable unlock code for one or more maps was found. All MapSource map are not accessible. Database Error: Internal problem with the unit. Contact your dealer or Garmin Customer Service to have the unit repaired. Deep Water: The water is deeper than the amount set in the Deep Water Alarm. Dragging Anchor: The distance set in the Anchor Alarm is exceeded. Lost Satellite Reception: The unit is unable to continue receiving satellite signals. Memory Full: Unit memory is full, no further data can be saved. Near Proximity Point: You have reached the distance set for a proximity waypoint. No Diff GPS Location: RTCM is selected but the unit is not receiving DGPS data. None Found: No data matched the search criteria. No Tide Stations for that Area: No tide stations within 100 miles of the area. Off Course: You are off course the distance set in the Off Course Alarm. Proximity Memory Full: No additional proximity waypoints can be saved. Proximity Radius Overlaps: The radius of two proximity waypoints overlap. Route Already Exists: You have entered a route name that already exists. Route Memory Full: No additional routes can be saved.

Garmin Data Cards

If you insert a data card and get a card format not recognized message, try removing the card and reinserting it. If the card is still not recognized, contact Garmin or your Garmin dealer for assistance. Data cards are not waterproof, should not be exposed to moisture or excessive static charges, and should be stored in the case supplied with the card. To remove a data card:
1. Grasp the card handle. The handle expands for easy removal. 2. Pull the card out of the card slot on the bottom of the unit. 3. If the unit is on, a conrmation tone sounds when the data card has been removed.

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Appendix WAAS and DGPS

What is WAAS? The Wide Area Augmentation System (WAAS) is an F.A.A. funded project to improve the overall integrity of the GPS signal. It is a space-based system that broadcasts integrity information and correction data as determined by ground reference stations (see below). Current tests have shown the actual accuracy to be on the order of 23 meters. For more information, go to http://gps.faa.gov/Programs/WAAS/ waas.htm.
NOTE: If you are using the GPSMAP 276C outside of the U.S.A., it is recommended that you turn off WAAS for the most accurate location x.
What is Differential GPS (DGPS)? The U.S. and Canadian governments (among others) have set up Differential GPS (DGPS) stations to transmit correction signals. They are operational in coastal areas and on many navigable river systems. The DGPS system is available for use without a fee. Please refer to the U.S. Coast Guards web site: http://www.navcen.uscg.gov/ for locations and the status of the differential sites. Using DGPS requires additional equipment.

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Accuracy Estimated position accuracy in feet or meters. Data Field Options Battery Timer The estimated time left on the battery (before it will need to be recharged. BearingThe direction from your current location to a destination. CourseThe direction from your starting location to a destination. Course to Steer The recommended direction to steer in order to reduce cross-track error and return to the course line. Cross Track The distance you are off a desired course in either direction, left or right. Depth(Marine Only) The distance from the surface of the water to the bottom. Distance (Destination) The great circle distance from current location to a Go To destination, or the nal waypoint in a route. Distance (Next) The great circle distance from current location to a Go To destination, or the next waypoint in a route. ETA (Destination) Estimated Time of Arrival. The estimated time you will reach a Go To destination, or the nal waypoint in a route. ETA (Next) Estimate Time of Arrival. The estimated time you will reach a Go To destination, or the next waypoint in a route. ETE (Destination) Estimated Time Enroute. The estimated time required to reach a Go To destination, or the nal waypoint in a route. ETE (Next) Estimated Time Enroute. The estimated time required to reach a Go To destination, or the next waypoint in a route. Elevation(Marine and Automotive Only) The altitude (height) above or below sea level. Location (Lat/Lon)Your current Latitude and Longitude in hddd mm.mmm and WGS 84. (Trip computer only) Location (Selected)You current GPS location displayed in the format you selected in for the POSITION FORMAT eld in the Set Units Page. (Trip computer only) Max SpeedThe maximum speed the unit has moved. Next Course The remaining distance of the route. Next TurnThe remaining distance to the next waypoint on the route. Pointer(Marine and Automotive Only) Display a direction pointer.