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Garmin Gpsmap 278 Manual

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Garmin Gpsmap 278 Gpsmap 278 Quick Reference Guide Rev. A, Sep, 2006
Garmin Gpsmap 278 Declaration OF Conformity Rev. A, Sep, 2006

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Garmin Gpsmap 278Lexerd - Garmin GPSMAP 278 TrueVue Anti-Glare Fish Finder Radar Screen Protector

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Gowridhar Madu 7:37pm on Tuesday, August 17th, 2010 
Big disappointment, I?ve had Garmin products before so thought I would stick with a brand I knew. I did a lot of online research, their website.

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Do not mount in front of an airbag eld of deployment.
Always operate the vehicle in a safe manner. Do not become distracted by the GPSMAP 278 while driving, and always be fully aware of all driving conditions. Minimize the amount of time spent viewing the screen of the GPSMAP 278 while driving and use voice prompts when possible. Do not enter destinations, change settings, or access any functions requiring prolonged use of the units controls while driving. Pull over in a safe and legal manner before attempting such operations.
WARNING: This product, its packaging, and its components contain chemicals known to the State of California to cause cancer, birth defects, or reproductive harm. This Notice is being provided in accordance with Californias Proposition 65. If you have any questions or would like additional information, please refer to our Web site at
GPSMAP 278 Owners Manual v


Failure to avoid the following potentially hazardous situations may result in injury or property damage. The GPSMAP 278 is designed to provide you with route suggestions. It does not reect road closures or road conditions, trafc congestion, weather conditions, or other factors that may affect safety or timing while driving. Use the GPSMAP 278 only as a navigational aid. Do not attempt to use the GPSMAP 278 for any purpose requiring precise measurement of direction, distance, location, or topography. The Global Positioning System (GPS) is operated by the United States government, which is solely responsible for its accuracy and maintenance. The governments system is subject to changes which could affect the accuracy and performance of all GPS equipment, including the GPSMAP 278. Although the GPSMAP 278 is a precision navigation device, any navigation device can be misused or misinterpreted and, therefore, become unsafe.
Map Data Information: One of the goals of Garmin is to provide customers with the most complete and accurate cartography that is available to us at a reasonable cost. We use a combination of governmental and private data sources, which we identify in product literature and copyright messages displayed to the consumer. Virtually all data sources contain inaccurate or incomplete data to some extent. In some countries, complete and accurate map information is either not available or is prohibitively expensive.

GPS Tips

While the receiver is gathering information, your location on the map might appear different from where you are actually located. As soon as the receiver gathers enough satellite information, your proper location appears on the map. When you travel more than 600 miles with the GPS receiver turned off, the receiver may take longer than normal to initialize and nd your location. The GPS receiver can lose satellite signals due to interference from such items as buildings, tunnels, and heavy tree cover. Monitoring the GPS status is recommended.
Start/Stop Simulatorstart and stop Simulator Mode, which is helpful when learning how to use your unit. Enable/Disable EGNOSenable or disable EGNOS capability. See page 109 of the Appendix for more information about EGNOS. Track Up Skyview/North Up Skyvieworient the sky view display on the GPS page to North up or Track up. New Altitudemanually enter your altitude. New Locationenter a new location automatically or using the map.
To learn about GPS, visit
Using the GPSMAP 278 Keypad


Press to cycle through main pages in sequence and exit a submenu page. Press and hold to switch between Marine and Automotive modes. QUIT Key Press to cycle through main pages in reverse sequence, revert to the previous value in a data entry eld, or cancel an unintended function.

IN Key/OUT Key

Press to adjust map scale to show a larger area with less detail (zoom out) or a smaller area with more detail (zoom in).


Press up, down, left, or right to highlight options and to enter data, or use to pan the arrow on the Map Page.


Press to select a highlighted option. Press and hold to mark your current location as a waypoint. MENU Key Press to open the options menu for the current page. Press twice to open the Main Menu.


Press to show the navigation menu. In Marine Mode, press and hold to activate the MOB function. In Automotive Mode, press and hold to show the Next Turn page and announce the next turn when using the external speaker.

Enable Auto Arrangeautomatically arranges the Find menu. When selected, Disable Auto Arrange and Restore Default options are available. Near Otherselect a new location from which to compile the Find items lists. Using the ROCKER, move the map arrow to the location you want, and press ENTER. Map Informationshows information about the detailed map data stored on the data card and allows you to select which maps appear on the Map Page.
Additional selections are available on the options menu when you are navigating:
Near Nextcompiles the Find items lists based on the next turn in the route.
Map Feature Information Page
Near Destinationcompiles the Find items lists based on the route destination. Near Current Routecompiles the Find items lists based on the active route.
2. Press PAGE or QUIT to exit the Information Page. You can also highlight one of the on-screen buttons, and press ENTER.
Creating and Using Routes

Creating a New Route

You can create and store up to 50 reversible routes, with up to 300 points each. Use the Route tab to create a route by selecting waypoints from the Find menu, or by selecting waypoints or map items from the Map Page. To create a route using the Find menu:
the Route Highlight Menu. tab on the Main
to open Press MENU oncemenu. the Route options
Highlight New Route, and press ENTER.
to nd Press ENTERroute. items to add to the
press HighlighttoOK, androute point. ENTER add a
dene Repeat step 5 topoints. additional route
To create a route using the map:
Highlight Edit on Map, and press ENTER.
location on the Highlight apress ENTER. map, and
NOTE: If you select an area of the map that is not a feature or waypoint, a new waypoint is created for that location. Press ENTER 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.

Navigating a Saved Route

To navigate a saved route:
Use the Navigate Route option to select and navigate a saved route.
1. Press the NAV key. 2. Highlight Navigate Route, and press ENTER. 3. Highlight a route, and press ENTER.

Select a route from list

1. Press the NAV key. 2. Highlight Go To Point, and press ENTER to open the Find menu. 3. Highlight Waypoints, and press ENTER. 4. Select a waypoint from the list, and press ENTER to open the Waypoint Review Page.
To navigate a new route using the Find menu:

Waypoint Review Page

5. With the Go To button highlighted, press ENTER to begin navigation.

Editing a Route

After you create a route, use the Route Review Page to edit, change the name, and review route points of a selected route.
1. Press MENU twice to open the Main Menu. Highlight the Route tab. 2. Use the ROCKER to highlight the name of the route, and press ENTER. 3. With the Route Review Page open, highlight the route name eld at the top of the page, and press ENTER.

1. Use the ROCKER to move the arrow to the map location or map feature you want. 2. Press and quickly release ENTER/MARK to capture the arrow location. Pressing and holding ENTER/MARK marks your current location, not the arrows location. If you have highlighted a map feature, an information page appears after you press ENTER. Use the ROCKER to highlight Save, and press ENTER to save the item as a waypoint. The New Map Waypoint Page appears.
To create a new waypoint using the Map Page:
3. To accept the waypoint with the default information, highlight OK, and press ENTER. To change the any information on the New Map Waypoint Page, highlight the appropriate eld and press ENTER. After entering your changes, highlight OK, and press ENTER.
Creating a Waypoint by Entering Coordinates
You can manually enter location coordinates to create a waypoint. This method is useful for creating a waypoint at a specic latitude/ longitude position from a chart. To create a new waypoint by entering location coordinates:

Reviewing a Waypoint

After you create and store a waypoint, you can modify, review, rename, move, or delete it at any time using either the Waypoint Review Page or Waypoint Edit Page. To access the Waypoint Review Page:
Highlight a waypoint on the Map Page, and then press ENTER to open the Waypoint Review Page. If the waypoint is located on a map feature or MapSource or BlueChart feature, the Waypoint Review Page might include additional tabs containing information about other features at that location.
1. Press ENTER/MARK to create a waypoint. The new waypoint is created with the next available waypoint number and the receivers last know location as the default location. 2. On the New Map Waypoint Page, highlight the Location eld, and press ENTER.
3. Use the ROCKER to enter location coordinates and press ENTER when nished. To change any of the other information on the New Waypoint Page, highlight the appropriate eld and press ENTER. After entering your changes, highlight OK, and press ENTER.
To access the Waypoint Edit Page:
1. Highlight the Points tab on the Main Menu, and then select a waypoint from the list.

User Points Tab

1. Select the Points tab on the Main Menu, and then highlight the User sub tab. 2. Highlight the waypoint you want in the list. 3. Press NAV to open the Navigate Menu. Highlight Go To <Point Name>, and press ENTER.
To navigate (Go To) a waypoint from the Points tab:

Editing a Waypoint

To edit a waypoint:
The User sub tab shows a master list of all waypoints stored in memory. From the User list, you can review, edit, rename, or delete individual waypoints or delete all user waypoints. The number of stored and available waypoints is shown at the bottom of the User sub tab. Stored waypoints arranged in alphanumeric order.
1. Open the Waypoint Review or Waypoint Edit Page. 2. Highlight the waypoint name, symbol, or eld you want to change, and press ENTER. 3. Use the ROCKER to select a symbol or enter data, and Press ENTER when nished.

Symbol eld

Name eld
1. From any of the waypoint pages or the Points tab, press MENU to open the options menu. 2. Select Edit Categories, and press ENTER. 3. Highlight Add, and press ENTER.

To create a category:

Waypoint Page
1. Highlight Next and press ENTER. The Waypoint list appears with the next waypoint highlighted. 2. Press ENTER to edit that waypoint.
To edit the next waypoint in the list:
Organizing Waypoints into Categories

Entering a new category

You can organize your waypoints into categories, to help manage your waypoints. For example, you can create a Vacation category that stores all of the waypoints you will use for your vacation. When the vacation is over, you can delete all the waypoints in that category. You can create up to 15 categories.
4. Use the ROCKER to enter a name for the category. 5. Highlight Save, and press ENTER.
To assign a category to a waypoint:
1. Open the Waypoint Edit Page. (You can also change the category on the New Waypoint Page.) 2. Select the Category eld, and press ENTER. 3. Select the category to which you want to assign the waypoint, and press ENTER.
Select the category to which you want to assign the waypoint.

Deleting Waypoints

You can delete waypoints from the waypoint list in the Points tab or from the Waypoint pages. To delete a waypoint from the Waypoint Page, use the ROCKER to highlight the on-screen Delete button and press ENTER.
NOTE: When you delete a waypoint from the list, it cannot be recovered from the unit. Back up important waypoints to a computer using the PC cable and interface software, such as MapSource Trip & Waypoint Manager, or write them down. 1. From the Points tab, use the ROCKER to highlight the waypoint you want to delete. 2. Press MENU, highlight Delete Waypoint, and press ENTER. A conrmation message appears.

During active navigation, the Compass Page guides you to your destination with a graphic compass display and a bearing pointer. When the pointer is pointing straight up, you are heading directly to your destination.
Rotating compass ring Course to steer indicator
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, and then continue in that direction.
NOTE: You must be moving for the compass to accurately update and show your heading.
Turning On the Compass Page
The Compass Page is on by default in Marine Mode but off by default in Automotive Mode.
1. Highlight the Display tab on the Main Menu 2. Highlight the Compass Page eld, and press ENTER. 3. Select On, and press ENTER.

Compass arrow

Data elds
To show the Compass Page in Automotive Mode:
Compass Page in Marine Mode
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 an arrow in the middle of the compass ring and a course to steer bug on the outside of the compass ring. The course to steer represents the direction to steer to get back to the course line.
Turning on the Compass Page
Compass Page Options Menu
Use the options menu on the Compass Page to customize the Compass Page. For denitions of data eld options, see page 120. Press MENU to open the Compass Page options menu.

Using the Marine Timer

The Marine Timer, specically designed for sail boat racing, allows you to easily count up or down by specied time increments. As is common in sail boat racing, there is often a 5-minute warning countdown, followed by a 4-minute preparation countdown, and nally a one-minute nal countdown. Then during the race, mariners might want to count up to keep track of their time. You can use your GPSMAP 278 to perform each of these different countdowns.

1. Press up or down on the ROCKER to highlight one of the Welcome Message elds, and press ENTER. 2. Use the ROCKER to enter information in the elds. You do not need to enter information in every eld. When nished, press ENTER again.
To add a welcome message:
3. To display the welcome message when you turn on your GPSMAP 278, highlight the Show at Power-up check box, and press ENTER to select it. To hide the welcome information at start-up, clear the check mark.
Serial Data Formatsets the data format to one of the following: Garmin Data Transferprovides the proprietary format used to exchange data with a computer or another Garmin unit. Garmin Data Transfer is disabled when the USB is connected, and the unit automatically switches to USB format. When the USB is disconnected, the USB eld changes to Transfer Mode. GARMIN DGPSconnects the GPSMAP 278 with a Garmin DGPS beacon receiver. Garmin Remote Sonarconnects the GPSMAP 278 with a GSD 21 or GSD 20 Sounder Module and transducer. NMEA In/NMEA Outsupports the input/output of standard NMEA 0183 version 3.01 data and sonar NMEA input support for the DBT, DSE, DPT, MTW, and VHW sentences. RTCM Inallows DGPS input using a standard RTCM format. RTCM In/NMEA Outallows DGPS input using a standard RTCM format and also provides NMEA 0183 version 3.01 output. RTCM In/Text Outallows Differential GPS (DGPS) input using a standard RTCM format and also outputs simple text data that includes data, time, location, and velocity.

COM 1 and COM 2 Sub Tabs

Use the COM 1 and COM 2 sub tab to change the data format and control the input/output format used when connecting your unit to external devices.

COM 1 Sub Tab

Text Outallows the unit to output simple text data that includes data, time, location, and velocity. The Baud can be set to 1200, 2400, 4800, or 9600. Noneprovides no interfacing capabilities. If you select GARMIN DGPS or RTCM In/NMEA Out format, you can control a differential beacon receiver directly from your GPSMAP 278 using the COM 1 or COM 2 sub tab. You can 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. If you use a DGPS receiver, WAAS capability is automatically turned off.
1. Set the unit to GARMIN DGPS or RTCM In/NMEA Out. 2. Highlight the Beacon eld, and press ENTER. 3. Highlight Scan, and press ENTER. 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.
Highlight Scan and press ENTER.
Shows the status of the scan
COM 1 Sub Tab with Garmin DGPS Selected
The Status eld shows one of the following: Tuningthe unit is attempting to tune to the specied frequency and bit rate. Scanningthe unit is automatically scanning through the frequencies and bit rates. Receivingthe unit is receiving DGPS signal and ready for operation. Check Wiringthe unit is not making connection with DGPS receiver.

Resizing the Split Screen
You can adjust the way the split screen appears. This option is only available when a zoom scale other than No Zoom is selected. To resize the Sonar Page split screen:
1. From the Sonar Page split screen, press MENU. 2. Using the ROCKER, highlight Size Split, and press ENTER. 3. Move the horizontal double-arrow left or right using the ROCKER until the vertical width line shows, then press ENTER. 4. If you want to cancel this operation, press QUIT or press MENU, highlight Stop Resizing, and press ENTER.
Using the Pointer on the Sonar Page
You can show the pointer (arrow) to reference sonar items and mark underwater waypoints. This makes it easier to nd and use an object such as a stump for a future shing location. When using this feature, the Sonar Page pauses. The depth continues to update while the display is paused, but the unit does not show any new sonar data until the Sonar Page resumes scrolling. You might see a discontinuity from where the sonar information stops and where it starts again.
1. From the Sonar Page, press MENU, highlight Show Pointer, and press ENTER. 2. Use the ROCKER to move the pointer to the location you want to mark. Press ENTER. The New Map Waypoint Page appears. 3. To change the name, symbol or depth, highlight the appropriate eld, and press ENTER. Make your changes and press ENTER. 4. When you are done making changes, highlight OK, and press ENTER. 5. To return to the standard Sonar Page, press QUIT; or press MENU, highlight Hide Pointer, and press ENTER.
To mark an underwater waypoint:

Setting Up Sonar

Use the Sonar tab on the Main Menu to set up the Sonar Page.
Depth Numberselect how efcient the digital depth update rate is. Fast Update updates quicker and is recommended for low-noise water deeper than 50 feet. Auto is best for shallow water or highnoise areas, has a slower screen update, and is best used if you travel a wide variety of depths. If the unit is unable to track the bottom for any reason, the digits in the depth window ash on and off to alert you that the unit is not tracking the bottom.
Fish Symbolsselect how the Sonar Page shows underwater targets and background information. Select Off to show all of the available information about the underwater environment. Select a sh symbol, to show only the information related to that symbol. Water Typeselect the proper water type you are boating in. Because sound waves travel through fresh and salt water at different rates, it is necessary to select the water type to ensure accurate readings on the unit.

Understanding the Sonar Display
One of the rst things to understand about sonar is that the transducer sends a beam down to the bottom of the water, much like the beam of a ashlight. The beam starts small near your vessel and expands as it gets to the bottom. See Transducer Coverage for more detailed information. The Sonar Page does not show a three-dimensional representation of the underwater environment; the display is in two-dimensions, much like if you took a picture of an aquarium. Only the depth of the item in the water appears. The Sonar display does not show you where an item is located horizontally in the water, as shown in the drawings below. The sh is not directly above the tree in reality, but it might look like it is on the Sonar Page.

Fish Sonar Page

Generally speaking, if the only thing between the transducer and the bottom is water, the rst strong return comes from the bottom directly below the transducer and sets the bottom level. Weaker secondary returns provide the detailed data. Stronger returns appear in darker colors, with red being the strongest return.

Tree Sonar Display 99

Aerial View of the Water

Transducer Coverage

The area covered by the transmitted sound waves is determined by the cone angle of the transducer and the water depth. The wide Coverage cone angles (40) associated with low frequencies (50 kHz) provide Diameter a large coverage area for nding sh within a coverage width that is approximately 2/3 of the water depth. However, this also means that wide cone angles produce less bottom detail and resolution. As shown in the drawing on the near right, the 40 cone angle produces a coverage area of approximately a 20-foot diameter circle at a 30-foot depth. The narrow cone angles (10) associated with high frequencies (200 kHz) provide better bottom resolution and crisper detail, but cannot show a large coverage area for nding sh. The 10 cone angle provides a coverage width that is approximately 2/10 of the water depth. As shown in the drawing on the far right, the 10 cone angle produces a coverage area of approximately a 6-foot diameter circle at a 30-foot depth. Dual frequency mode combines both frequencies to get the best coverage area and contour/depth readings.

Depth Coverage Diameter

40 Cone Angle (50 kHz)

10 Cone Angle (200 kHz)

The GSD 20 or GSD 21 can help you determine whether the bottom is hard or soft. When the sonar sound waves are reected back by the bottom, a hard bottom returns a stronger signal than a soft bottom. A thin whiteline indicates a softer bottom, while a thick whiteline indicates a harder bottom. Normally, a red line is used to show the point where water meets the bottom. This line follows the bottom contour, along with any signicant objects lying on the bottom. The unit uses the whiteline function to make the bottom layer information easier to distinguish.


A rough denition of a thermocline is a break in water where the water temperature changes faster than the water above it. Thermoclines are shown as the weakest colors. One of the unique features offered by Garmin is See-Thru technology, which allows the GPSMAP 278 to hear both weak and strong signals simultaneously so it can identify sh returns under the toughest conditions, such as suspended in thermoclines or even hiding near structures. See-Thru technology allows the GSD 21 or GSD 20 Sounder Modules to see through thermoclines and helps locate sh where they live.
Thick Whiteline: Hard bottom

Whiteline On

Whiteline Off





Physical Specications

Size: Weight: Display: Case: Temp. Range: 5.7" W x 3.2" H x 1.9" D (14.5 x 8.1 x 4.8 cm) 14.0 oz (0.40 kg) 3.75" diagonal (9.5 cm) Transective, 256-color display with backlighting (480 x 320 pixels) Fully gasketed, high-impact plastic alloy, waterproof to IEC 60529 IPX7 5F to 140F (-15C to 60C) Rechargeable lithium-ion 7-15 hours 1135 VDC 3AG - 1.5 Amp


Receiver: Differential-ready 12 parallel channel receiver Acquisition Times: Approx. 15 seconds (warm start) Approx. 45 seconds (cold start) Approx. 5 minutes (First Time/AutoLocate) Update Rate: 1/second, continuous Accuracy GPS: DGPS (USCG): DGPS (WAAS): Velocity: Dynamics: 15 meters (49 feet) RMS 95% typical 35 meters (1016 ft), 95% typical < 3 meters (10 ft) 95% typical with DGPS corrections 0.1 knot RMS steady state 6 g's
Battery: Battery Life: Source: Fuse:

Optional Accessories

In addition to the standard accessories included with your GPSMAP 278, several optional accessories are available to enhance the operation of the GPSMAP 278. To obtain replacement parts and optional accessories, contact your Garmin Dealer, Garmin Product Support at 800/800.1020, or Garmin Europe at 44/0870.8501241.
WARNING: Garmin accessories have been designed and specically tested for use with Garmin products. Accessories offered by other manufacturers have not been tested or approved for use with Garmin products. Use of such accessories could cause damage to the GPSMAP 278 and void the warranty.
Programmable Data Cards: Blank data cards available in 16 MB, 32 MB, 64 MB, 128 MB, 256 MB, and 512 MB sizes. Download detailed map data from MapSource CD-ROMs to a data card, either directly through your GPSMAP 278 using the PC USB cable, the optional PC Interface cable, or with the optional USB Data Card Programmer. USB Data Card Programmer: Programs blank data cards at high speed through a PC. Carrying Case: Protects the GPSMAP 278 when not in use; has storage space for data cards. Protective Cover: Snaps on the front of the unit to protect the screen from damage. MapSource Software CD-ROMs: Offers several detailed mapping options that are compatible with the GPSMAP 278, including BlueChart (outside the USA), Fishing Hot Spots, and Topo. Pre-Programmed Data Cards: Data cards preprogrammed with either Garmin BlueChart (outside the USA), BlueChart g2, or Fishing Hot Spots map data.

To remove a data card:

To install a data card:


The following formats are supported for connection of external devices: GARMIN proprietary Differential GPS (DGPS), NMEA 0180, 0182, 0183 (versions 1.5, 2.0, 2.3, 3.01), ASCII Text Output, and RTCM SC-104 input (version 2.0). The following are the Approved Sentences for NMEA 0183, version 3.01 output: GPRMC, GPGGA, GPGSA, GPGSV, GPGLL, GPBOD, GPRTE, and GPWPL. The following are the Proprietary Sentences for NMEA 0183, version 3.01 output: PGRME, PGRMZ, and PGRMM. The GPSMAP 278 also includes NMEA input with support for the BWC, DBT, DPT, DSC, DSE, MTW, VHW, VTG, and XTE sentences. Garmins proprietary communication protocol is available from the Web site (
1. Remove the external power cable from the connector on the back of the GPSMAP 278. 2. Rotate the antenna to approximately a seven oclock position. The alignment notches in the casing must line up with the notches on the antenna. 3. Pull the antenna away from the GPSMAP 278 unit.
To remove the GPS antenna:

Removing the GPS Antenna

You can remove the GPS antenna to use an external antenna. After the antenna is removed, the BNC connector is exposed and ready for use with an external antenna. For information on connecting an external antenna to the GPSMAP 278, refer to the installation instructions that came with the antenna.


The European Geostationary Navigation Overlay System (EGNOS) is European Space Agency developed service to improve the overall integrity of the GPS signal and increase position accuracy for users in Europe. In North America, EGNOS is referred to as WAAS. The system is made up of satellites and network of ground reference stations positioned across Europe that monitor GPS satellite data. All SBAS systems use the same receiver frequency; therefore any operational SBAS system should be capable of providing your GPS unit with increased accuracy at any location in the world. Currently, enabling EGNOS/WAAS on your Garmin GPSMAP 278 in regions that are not supported by ground stations may not improve accuracy, even when receiving signals from an SBAS satellite. In fact, it can degrade the accuracy to less than that provided by GPS satellites alone. For this reason, when you enable EGNOS/WAAS on your Garmin GPS receiver, the receiver automatically uses the method that achieves the best accuracy. To enable EGNOS/WAAS, see to page 6.

To add a new Directory entry:
1. Open the DSC Directory on the Main Menu. 2. Use the ROCKER to highlight the rst blank space in the directory list and press ENTER. OR Press MENU, highlight New Item, and press ENTER. 3. Enter the MMSI number, the name, and any comments. 4. When nished, highlight OK, and press ENTER.

Setting Up DSC

Highlight OK and press ENTER to save the directory entry. New Directory Item Page
Use the Setup sub tab to turn DSC on and off. If you have more than one chartplotter and only want DSC to display on another chartplotter, turn DSC off on this unit. This Setup sub tab also allows you to simulate Distress Calls and Position Reports while the unit is in Simulator Mode. Simulating calls is helpful for practice before connecting to the real system. The Distress Call simulator also helps to check if alarms are working properly.
After creating a New Directory Item, the name created is attached to that particular MMSI number. If you return to the Log, the new name appears under the corresponding MMSI number. Another way to input a name is from the Entry Review Page or the DSC Distress Call or DSC Position Report pages. The Name and MMSI are sent to other Garmin GPS units: Only the MMSI numbers are sent to other non-Garmin DSC users.

Making a Distress Call

To make a Distress Call, press the MayDay button on your VHF radio. The call transmits on an emergency channel with the MMSI number attached to the call, if you have DSC support. Any DSCequipped mariner (on sea or land) within range can receive the call.

DSC Setup

What is a Maritime Mobile Service Identity (MMSI) Number?
MMSI allows a VHF radio to act like a phone. The 9-digit MMSI number acts like a phone number when used in a position report and as a unique identier to the Coast Guard when used in an emergency distress call. To obtain a MMSI number, users must register their VHF radio with the FCC (Form 605). Garmin does not supply this number! For more information regarding MMSI numbers, visit
Non-Federal Users in the United States Commercial users, or those who travel outside the United States or Canada, must apply for a ship station license or an amendment to a ship station license. To nd out if you require a Ship Station license, visit If your vessel requires licensing by the FCC, you can obtain a MMSI during the application/licensing process when you le FCC Forms 159 and 605. Federal Users in the United States Federal users can obtain MMSI assignments from their agency radio spectrum management ofce. These procedures are currently under review by the National Telecommunications and Information Administration (NTIA). Users Outside the United States Users can obtain an MMSI assignment from their telecommunications authority or ship registry, often by obtaining or amending their ship station license. Users In Canada Industry Canada is responsible for assigning MMSI numbers to commercial and recreational vessels. Information is available at the following Web site:

data card 107 information 21, 44 slot 1 data elds changing 43 options 120 date 83 daylight saving time 83 day view 74 DB-Declaration of Conformity (DoC) 117 declutter 47 deep water 73 defaults 8, 10 delete category 35 DSC Call 113 DSC directory item 114 track log 39 waypoint 36 depth 84 detour 62 DGPS 86, 87, 88 alarm 72 digital selective calling. See DSC direction display 84 display tab 79
distance and speed 84 distress calls 69, 112117 drift 73 DSC 69, 112113 DSC Tab 69 nd current location 3 nd menu 17 shing 77 sh symbols 95 asher 97 fuel ow 27
route 25, 26, 61 waypoints 33 editing a waypoint 33 EGNOS 6, 81 emergency 112 entering data 9 erase track log 39 European Geostationary Navigation Overlay System. See EGNOS exits 17 external power source 2 external voltage alarm 72
getting started 1 going to a destination 14 go to distress call 114 history 20 position report 114 GPS off/on 5 options 6 tips 6 GRI Chain 110 GSD 20 90
icons 79 identier 116 information page 21, 47 initialize 3 installation 104 interval 41 invert 54 item details 21
keypad 7 language 80, 81 legs, track 41 lithium-ion battery 2 local time 83 location 6, 30 location format 84, 111 log lter 79 longitude 120 LORAN TD Setup 109 lost satellite reception 5
faster time 82 FCC 112, 116, 124 eld 8 nd 17 from a different location 18, 19 menu 21, 24 nding an item 1721 126
heading 85 highways avoid 82 highway page 52, 80 hiding/showing 52 options menu 53 setup 53 hunt & sh sub tab 77
magnetic variation 85 main menu alarms tab 71 calendar tab 73
celestial tab 74 display tab 79 DSC tab 69 GPS tab 2, 67 message tab 78 points tab 68 sonar tab 71 track tab 68 manual conventions i Man OverBoard. See MOB MapSource 107 map datum 111 map orientation 45 map page 42, 63 declutter 47 setup 44 marine mode pages 4246 marine pages 4255 active route 54 compass 49 highway 52 map 42 position data 55 marine timer 50 maritime mobile service identity. See MMSI marking a waypoint 9, 29, 30, 32 underwater 94 GPSMAP 278 Owners Manual
MayDay 115, 117 measuring distance 48 messages 120 message tab 78 mils 84 MMSI 69, 116 MOB 14, 16 month view 74 moon information 76 next turn 83 alarm 72 NMEA 86, 88, 108 north up 6, 45 power 2, 3, 104 connector 1, 2 outlet 2 practice mode. See simulator mode project waypoint location 32 proximity 36 alarms 36 points tab 36 waypoint 37



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