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Garmin Gpsmap 640


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Garmin Gpsmap 640Garmin GPSMAP 640 - Marine, automotive Chartplotter - LCD - 800 x 480 - color

Garmin - 5.2 inch - With Mount

With the Garmin GPSMAP 640, you'll get a full-featured marine chart plotter and an on-the-road navigator. The GPSMAP 640 comes standard with a high-sensitivity GPS receiver and brilliant, high-resolution touch screen display so you'll always know the way whether you're on land or at sea.


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User reviews and opinions

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Comments to date: 5. Page 1 of 1. Average Rating:
m4c0 12:55am on Sunday, September 5th, 2010 
This is an incredible device. The functionality makes it more useful than I could have imagined.
caput 6:45pm on Wednesday, June 30th, 2010 
this thing is ready to go out of the box, and is very simple to use for newbies, but also has all the functions for those gurus, thanks NEWEGG!!!!!
JanOSch 6:11pm on Tuesday, June 8th, 2010 
Great tool. Easy to Use, Auto Lap, History, Custom Screens, Intervals Not really any for this basic model
yuvarajmani 8:35am on Wednesday, June 2nd, 2010 
only used once or twice but have no complaints. there is alot to read to set up and understant unit. Very much like this. Bought with a Rino 130 so that I could geocache with my wife. Both are great radios and great GPSs.
papajoe 7:09pm on Thursday, May 27th, 2010 
I would give the overall rating a 9.5 for features and ease of usage as well as durabillity.

Comments posted on are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.




Automotive Mode: Advanced Configuration.66
Changing the System Settings... 66. Changing the Navigation Settings... 66. Adjusting the Display Settings.. 66 Adjusting the Volume... 67 Adjusting the Backlight... 67. Updating the Time Settings.. 67 Setting the Languages... 67 Changing the Map Settings... 67. Changing Security Settings... 68. Restoring All Settings... 68 Listening to XM Radio... 69 Using XM Traffic Information.. 70. Traffic in Your Area... 70 Severity Color Code... 70 Traffic on Your Route... 70 Viewing the Traffic Map.. 71. Viewing Traffic Delays... 71. Adding an XM Subscription... 71. Calibrating the Screen... 72 Resetting Your GPSMAP640... 72 Updating the Software... 72
Automotive Mode: Using the Map.61.
Automotive Mode: Using XM..69
Automotive Mode: Managing Files..63
Automotive Mode: Using the Tools..65


Clearing User Data... 72 Battery Information... 72 Charging Your GPSMAP640.. 73 Changing the Fuse on the Automotive Mount.. 73 Additional Maps... 73 About GPS Satellite Signals.. 73 Extras and Optional Accessories.. 74 Specifications... 74 Declaration of Conformity... 75 Software License Agreement.. 75 Troubleshooting... 75 Messages and Alarms (Marine Mode).. 76


Getting Started
Identifying the GPSMAP640 Features
Identifying the GPSMAP640 Mounting Bracket Features
Automotive Mounting Bracket
Power buttonmanually turn the device on or off. Batteryremovable lithium-ion rechargeable battery. Battery locking ringlift and rotate counter-clockwise to release the battery. DC inpower the device and recharge the battery with an external power cable. MCX connectorconnect an external GPS antenna. USB connectorconnect the device to a computer or to an optional GXM 40 XM antenna (GPSMAP 640 only).

Marine Mounting Bracket

Bail-mount adapterconnect the marine mounting bracket to the marine bail mount.
Ball-socket adapterconnect the mounting bracket adapter to a compatible automotive dash mount. Audio line outconnect the unit to an audio output source with a standard 1/8 in. (3.5 mm) stereo audio plug. Locking tabuse to lock the device into the mount.

Caution: Even when you carefully create a route, legs may pass over land or shallow water. Use visual sightings and steer to avoid land, shallow water, and other dangerous objects.
Saving a Created Route (Route To)
You can save up to 50 routes, with up to 250 turns in each route.
1. After you create a route, touch Menu > Stop Navigation. 2. Touch Yes to save your current active route.
When you are off course, an orange arrow appears to help steer you back onto the route leg to the next turning point. This orange arrow represents the Course to Steer.
1. After you create a route using Route To or choose a saved route from the Where To? menu, from the Home screen, touch Charts and then touch Navigation Chart, Perspective 3D, or Mariners Eye3D.
GPSMAP640 Owners Manual17
2. Follow the magenta and purple line (route leg) from the start point to the first turning point. 3. After you reach the first turning point, follow the magenta and purple line (route leg) to each subsequent turning point, until you reach the end point. 4. Steer off course to avoid land, shallow water, and other obstacles on the water. 5. When you are off course, follow the orange arrow (Course to Steer) to steer back to the magenta and purple line (route leg).

Route turn Route leg

Route turn

Course to Steer

Route leg Following a Route on the Mariners Eye 3D Screen
Course to Steer Start point
NOTE: When following a route, important navigation information appears in a data bar along the top of the chart. To adjust the settings of the data bar, see page 40.
Setting an Automatic Course (Guide To)
Following a Route on the Navigation Chart
When using a preprogrammed BlueChart g2 Vision SD card, you can use Automatic Guidance to automatically create a suggested passage based on available BlueChart g2 Vision chart information. See page 37 for instructions on setting up Automatic Guidance for your boat.
When the pointer icon is on the location you want to navigate to, or you have selected a destination using Where To?, touch Navigate To > Guide To.
Caution: The Automatic Guidance feature of the BlueChart g2 Vision SD card is based on electronic chart information. Carefully compare the course to all visual sightings, and avoid any land, shallow water, or other obstacles that may be in your path.
4. When you are off course, steer back to the magenta line when the path is clear.
Following an Automatic Course (Guide To) on the Navigation Chart, the Perspective 3D Screen, or the Mariners Eye 3D Screen

4. Touch Navigate To or Follow Track to begin navigation. See page 14 for information about navigating to a destination. See page 23 for more information about tracks.

Searching by Name

Use the Search by Name menu to search all marine services, waypoints, saved routes, and saved tracks.
1. From the Home screen, touch Where To? > Search by Name. 2. Use the on-screen keyboard to type the name or part of the name of the marine service, the waypoint, the saved route, or the saved track you want to find, and touch Done. 3. A list of results appears. Touch the item you want to navigate to. Each entry is marked by an icon to help identify which category it belongs to: marine service icon default waypoint icon (this icon can be changed using the waypoint properties, see page 23) saved route icon saved track icon
GPSMAP640 Owners Manual21
Marine Mode: Using Waypoints and Tracks
Marine Mode: Using Waypoints andTracks
Create waypoints in locations that you want to return to, such as your marina or a good fishing spot. You can store up to 1,500 marine waypoints with a user-defined name, symbol, depth, and water temperature for each waypoint. A track is a recording of your path. The track currently being recorded is the active track. You can save your active track.
2. Touch Man Overboard. This designates the waypoint as an MOB waypoint and begins navigation automatically.
1. Touch Mark on any screen. This marks your current location as a waypoint with an automatically generated name. 2. Choose from the following options: Edit Waypointdesignates a specific name, a symbol, a water depth, a water temperature, or a position. Deletedeletes the waypoint. Man Overboarddesignates the current location as a Man Overboard (MOB) waypoint. Backreturns to the previous screen.
Marking a Waypoint at Your Current Location
Using Man Overboard (MOB) Waypoints
Use a Man Overboard (MOB) waypoint to both create a waypoint with an international MOB symbol ( ) and immediately begin navigating to the MOB waypoint with a direct course (Go To).

Compass Tape: Displays the current heading. An indicator that shows the bearing to the desired course is displayed while navigating. When you are off course, the distance between your current heading and the corrected course is called the Course to Steer, and is shaded orange on the compass tape.

Bearing indicator

Heading indicator

Compass Tape Off Course

Compass Tape On Course GPSMAP640 Owners Manual 41
Chart Appearancecustomize the appearance of the Navigation chart. Orientationchange the perspective of the map display: North Upset the top of the map display to a north heading. Head Upset the top of the map display according to your GPS heading. The heading line appears vertically on the screen if it is shown. If the device is connected to a NMEA 0183 heading sensor, the map remains oriented according to GPS heading (course over ground), but the vessel icon rotates according to magnetic heading from the sensor. Course Upset the map so the direction of navigation is always up. Detailadjust the amount of detail shown on the map. Heading Linedraws an extension from the bow of the boat in the direction of travel. Offturn off the heading line. Distanceset the distance to the end of the heading line. Timeset the amount of time until you reach the end of the heading line.
World Maptoggle the world map (basemap) between a basic world map and a full world map. The basic world map shows coastal outlines of the world, with land indicated in yellow. The full world map shows the coastal outlines of the world with the land covered in a low-resolution photo image. Spot Depthsturn on spot soundings and set a dangerous depth. Safety Shading (with compatible BlueChart g2 Vision cards) areas with depths shallower than the specified value are shaded in blue, while areas with depths greater than the specified value are shaded in white. The contour is always drawn at, or deeper than, the selected depth. Symbolscustomize the symbols that appear on the Navigation chart. Navaid Sizeadjust the size of the symbols shown on the map. Navaid Typeset the navaid symbol set: National Oceanic and Atmospheric Administration (NOAA) or International Association of Lighthouse Authorities (IALA).
Land POIstoggle Points of Interest (POI) icons shown on land (this option is only available when using a BlueChart g2 Vision SD card). Light Sectorsadjust the drawing of light sectors on the map. Chart Borders(GPSMAP640) toggle the preloaded BlueChart g2 chart borders on or off.
The Sailing data bar displays Wind VMG when the Route Leg data bar is on and you are navigating a route.
Configuring Perspective 3D Options and Mariners Eye 3D Options
From the Perspective 3D screen or the Mariners Eye 3D screen, touch Menu. Waypoint and Tracksprovides access to waypoint and track information shortcuts, as on the Navigation chart. See page 39. Other Vesselsprovide access to AIS and DSC shortcuts, as well as chart-specific AIS display settings, as on the Navigation chart. Seepage 39. Weather Radartoggle the NEXRAD weather overlay on or off. This option is only available when connected to a Garmin GXM 40 XM antenna device. See page 47 for more information on interpreting weather features. Data Barscontrol how charting numbers appear on the screen, as on the Navigation chart. See page 40. You can also turn the compass tape on or off (see page 41). Chart Appearancecustomize the appearance of the Perspective 3D or Mariners Eye 3D screen.

Fish Eye 3D Settings

From the Fish Eye 3D screen, touch Menu. Viewchange the viewpoint. Choose the direction you want the camera to point. For example, if you touch Port, the view places the camera to starboard, looking across the boat to port. Trackstoggle tracks on or off.
Weatherconfigure the appearance of weather options on the Fishing chart, as on the Navigation chart. See page 40. Instead of Cloud Cover and Visibility, the weather appearance option on the Fishing chart contains toggles for Sea Temp and Fish Species. Chart Appearancecustomize the appearance of the Fishing chart. Orientationchanges the perspective of the map display, as on the Navigation chart. See page 42. Detailadjusts the amount of detail shown on the map. Heading Linedraws an extension from the bow of the boat in the direction of travel, as on the Navigation chart. See page 42. Navaid Sizeadjusts the size of the symbols shown on the map. Navaid Typesets the navaid symbol set (NOAA or IALA).
Wrapcontinuously records the track log, replacing the oldest track data with new data. Intervaldefine the frequency at which the track is recorded. Recording more-frequent plots is more accurate, but fills the track log faster. Intervalset whether the interval is determined by distance, time, or resolution. (Touch Change to set the quantity.) Distancerecord the track based on a distance between points. Timerecord the track based on a time interval. Resolutionrecord the track based on a variance from your course. This setting is recommended for the most efficient use of memory. The distance value (Change) is the maximum error allowed from the true course before recording a track point. Changeset the value of the interval. Track Colorset the color of the track.
Configuring the Active Track Options
Record Modeselect Off, Fill, or Wrap Offdoes not record a track log. Fillrecords a track log until the track memory is full.
From the Home screen, touch Information > User Data > Tracks > Active Track Options.
Configuring the Numbers Screen
From the Home screen, touch Dashboard > Numbers > Menu > Configure.

Fa vorites

You can save places in your Favorites so you can quickly find them and create routes to them. Your home location is also stored in Favorites.
From the Map page, touch the vehicle icon ( Location to save your current location.

). Touch Save

Saving Places You Find
1. From the Go! page, touch Save. 2. Touch OK. The place is saved in Favorites.
1. Touch Where To? > Favorites. 2. Select the category and the location you want to edit. 3. Touch Edit. 4. Touch an item to edit: Change Nameenter a new name, and touch Done. Attach Photoselect a picture that you have loaded on your GPSMAP640 or on an SD card to assign to the location. Change Map Symboltouch a new symbol used to mark this location on the map. Change Phone Numberenter a phone number, and touch Done. Change Categoriesselect another category for the location. Deletetouch Yes to remove this item from the Favorites list.

Editing Saved Places

Finding a Place Using the Map

Finding Saved Places

1. Touch Where To?. 2. Touch Favorites. Your saved locations are listed.
Use the Browse Map page to view different parts of the map. Touch Where To? > Browse Map.
Tips for Browsing the Map
Touch the map, and drag to view different parts of the map. Touch and to zoom in and out. Touch any object on the map. An arrow appears pointing at the object. Touch Save to save this location. Touch Go! to navigate to the location. If the GPS mode is off, touch Set Loc to set your simulated location to the selected location.
6. Touch to add another location to your route. Touch to remove a location. 7. Touch Next to calculate your route and view it on the map. 8. Touch Save to save the route and exit. 1. Touch Where To? (or Tools) > Custom Routes. 2. Select the route you want to edit. 3. Touch Edit. 4. Touch an option to edit the route: Change Nameenter a new name, and touch Done. Add/Remove Pointsadd or remove points from the route. Manually Reorder Pointschange the order of points along your route. Optimally Reorder Points automatically order the points. Recalculatechange the route preference to calculate by faster time, shorter distance, or off road. Deleteremove this route.

Editing Custom Routes

Using Custom Routes

Creating a Custom Route

Touch Where To? > Custom Routes. Select the route you want to take, and touch Go!. Use your GPSMAP 640 to create and save routes before your next trip. You can save up to 10 routes.

Reset the trip computer before beginning a trip. From the map, touch the Speed field. Touch Reset Trip to reset the information on the trip computer. Touch Reset Max to reset the maximum speed.
Automotive Mode: Managing Files
You can store files, such as JPEG image files, in the internal memory on the GPSMAP640 or on an SD card. NOTE: The GPSMAP640 is not compatible with Windows 95, 98, Me, or Windows NT. It is also not compatible with Mac OS 10.3 and earlier. This is a common limitation of most USB mass storage devices. The GPSMAP 640 supports the following file types: JPEG and JPG image files. Maps and GPX waypoint files from MapSource: see page 73. NOTE: User data is not shared between automotive mode and marine mode.
NOTE: Some operating systems or computers with multiple network drives cannot display the GPSMAP640 drives. See your operating system Help file to learn how to map the drives. 4. Browse your computer for the file you want to copy. You can copy JPEG and JPG image files or maps and GPX waypoint files from MapSource. 5. Highlight the file, and click Edit > Copy. 6. Open the Garmin or memory card drive/volume. 7. Click Edit > Paste. The file appears in the list of files in the GPSMAP640 memory or on the memory card. 8. When you are finished transferring files, click the Safely Remove Hardware icon in your toolbar (system tray), or drag the volume icon to the Trash on Mac computers. 9. Unplug your GPSMAP 640 from your computer.
Copying Files to the Unit
1. Insert an SD card in the GPSMAP640 unit (optional). 2. Connect a mini-USB connector to the back of the GPSMAP640. 3. Connect the larger end of the cable to an available USB port on your computer. Your GPSMAP640 and memory card appear as removable drives in My Computer on Windows computers and as mounted volumes on Mac computers.
1. Check your MapSource version on your PC by clicking Help > About MapSource. If the version is older than 6.12.2, update to the most current version by clicking Help > Check for Software Updates or check the Garmin Web site at 2. Connect a mini-USB connector to the back of the GPSMAP640.
Copying Automotive Data to the Unit Using MapSource
3. Connect the larger end of the cable to an available USB port on your computer. Your GPSMAP640 and memory card appear as removable drives in My Computer on Windows computers and as mounted volumes on Mac computers. NOTE: Some operating systems or computers with multiple network drives cannot display the GPSMAP640 drives. See your operating system Help file to learn how to map the drives. 4. From MapSource, click on Transfer > Send to Device. 5. From the Send to Device window, select the drive for the GPSMAP 640, and the types of data you want to copy to your device. 6. Click Send. MapSource transfers a file named Temp.gpx file to the Garmin\GPX directory. 7. Click the Safely Remove Hardware icon in your toolbar (system tray), or drag the volume icon to the Trash on Mac computers. 8. Unplug your GPSMAP640 from your computer.

Deleting Automotive Files
Connect the GPSMAP640 to your computer, and open the GPSMAP640 or memory card drive/volume. Highlight the file you want to delete, and press the Delete key on the computer keyboard.
NOTICE: If you do not know the purpose of a file, do not delete it. Your GPSMAP640 memory contains important system files that should not be deleted.
Automotive Mode: Using the Tools
The Tools menu provides many features that are helpful when you are traveling. From the Menu page, touch Tools to access the Tools menu.

Viewing a Slide Show

Touch Slide Show to start a slide show, which displays each image for a few moments and then displays the next image. Touch anywhere on the screen to stop the slide show. Touch Stop to return to the list of pictures. Touch Resume to resume the slide show. Touch and to zoom in and to zoom out.


For information about the settings, see page 66.

Navigating to a Picture

Where Am I?
Touch Where Am I? to view current location information, including hospitals, police stations, and fuel. This feature is helpful if you need to tell emergency personnel your location. Touch Save Location to save your current location.
If a picture contains location information, touch Info, and then touch Go! to create a route to it.

My Data

Touch Tools > My Data to manage and delete your saved data, such as your Favorites.

Picture Viewer

Use the picture viewer to view pictures that you have stored in your GPSMAP640 or on an SD card. See page 63 for more information about loading pictures to your GPSMAP640.
1. Touch Tools > Picture Viewer. 2. Touch a picture to view a larger image of it. 3. Touch the arrows to view all the images.
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Automotive Mode: Advanced Configuration
1. Touch Tools > Settings. 2. Touch the setting you want to change. 3. Touch the button under the setting name to change it.
Changing the Navigation Settings
Touch Tools > Settings > Navigation. Route Preferenceselect a preference for calculating your route: Faster Timeto calculate routes that are faster to drive but can be longer in distance. Shorter Distanceto calculate routes that are shorter in distance but can take more time to drive. Off Roadto calculate point-to-point routes (without roads). Avoidancesselect the road types you want to avoid on your routes. Restorerestore the original navigation settings.

3Ddisplay the map in three dimensions (3D) with your direction of travel at the top. Vehicletouch Change to change the icon used to display your position on the map. Touch the icon you want to use, and then touch OK. Download additional vehicle icons at Trip Logshow or hide the log of your travels. To clear your trip log, touch Tools > My Data > Clear Trip Log. Map Infoview the maps and the version of each map loaded on your GPSMAP640. Touch a map to enable (check mark) or disable (no check mark) that map. Restorerestore the original map settings.
1. Touch Tools > Settings. 2. Touch Restore. 3. Touch Yes.

Restoring All Settings

Changing Security Settings
Touch Tools > Settings > Security. Safe Modeturn the safe mode on or off. When your vehicle is moving, Safe mode disables all functions that require significant operator attention and could become a distraction while driving. Restorerestore the original security settings.
Automotive Mode: Using XM
Automotive Mode: XM Using
Your GPSMAP640 can receive XM radio, XM weather, and XM traffic using an optional XM smart antenna (such as the GXM40). For more information about an XM smart antenna and XM subscriptions, visit

Listening to XM Radio

1. Connect an optional XM antenna to the GPSMAP640. 2. Touch Tools > XM Services > XM Radio to open the XM Radio player.
NOTE: To open the XM Radio player directly from the Map page, touch the XM Radio player icon ( ).
Now playing Browse category XM signal strength
Touch Tools > XM Services. XM Radioopens the XM tuner. Local Weatherdisplays current weather conditions based on your present location. Touch Forecast to view a five-day weather forecast for this area. Weather Mapdisplays current weather conditions on the map. See page 58 for tips on browsing the map.
Automotive Mode: XM Radio player


to go to the next channel in the browse category.
Touch to go to the previous channel in the browse category. Touch Browse to search a category, such as Recent Channels, Kids, or Urban. Adjacent to each channel is the current program information. Touch a channel to listen to that channel. Touch 123 to enter an XM channel. Then touch Done to listen to that channel.
Touch Save to save a channel to Presets (maximum of 20). Touch Delete to remove the current channel from your Presets. To delete more than one channel from Presets, touch Browse > Presets > Delete. A list of all your Presets appears. Touch the items you want to delete. Touch Delete > Yes.

Traffic in Your Area

When you are receiving traffic information, a traffic icon appears in the upper-left corner of the Map page. The traffic icon changes color to indicate the severity of traffic conditions on your route or the road you are currently travelling.

Touch , and then use

to adjust the volume.

Severity Color Code

Color Green Yellow Red Description Low severity Medium severity High severity Meaning Traffic is flowing normally. Traffic is slightly congested. Traffic is heavily congested or stopped.
Using XM Traffic Information
Your GPSMAP640 can receive and use traffic information using an optional XM smart antenna (such as the GXM 40). When a traffic message is received, your GPSMAP640 displays the incident on the map and can change your route to avoid the traffic incident. NOTE: Garmin is not responsible for the accuracy of the traffic information. The XM antenna receives signals from the XM traffic provider and displays that information on your GPSMAP640. NOTE: You can only access the traffic information if the GPSMAP640 is connected to an XM antenna and you have an XM traffic subscription (see page 69).

Traffic on Your Route

When calculating your route, the GPSMAP 640 device examines the current traffic and automatically optimizes the route for the shortest time. If a severe traffic delay occurs on your route while you are navigating, the device automatically recalculates the route. You might still be routed through traffic if no better alternative routes exist.
If a non-severe traffic delay occurs on your route, the traffic icon shows how much time the delay has added to your route. This time is already included in your estimated arrival time.
To manually avoid traffic on your route: 1. On the Map page, touch the traffic icon. 2. Touch Traffic On Route. 3. Touch the arrows to view other traffic delays on your route, if necessary. 4. Touch Avoid to avoid the traffic delay.
3. Touch an item in the list to view the delay on a map and details about the delay. If there is more than one delay, touch the arrows to view the additional delays. 1. To view XM subscription information, open the XM Radio player (see page 69). 2. Set the channel to zero (0). 3. Touch Radio ID to open the XM Subscriptions page. 4. Touch Subscribe. 5. Follow the on-screen instructions.
Adding an XM Subscription

Data storage: Internal memory and optional removable SD card. Data stored indefinitely. Computer interface: USB 2.0 high-speed and full-speed mass storage Operating system: Garmin Charge time: Approximately 6 hours Power input: 1132 Vdc, vehicle power using vehicle power cable, or ACpower using the included AC adapter. Usage: 12 W max. Battery life: Up to 9 hours with minimum backlight and no XM antenna; up to 5 hours with maximum backlight and no XM antenna; up to 3.5 hours with maximum backlight and a GXM 40 antenna. Battery type: User-replaceable rechargeable lithium-ion battery GPS receiver: High-sensitivity Compass-safe distance: 17 in. (43.18 cm)
Declaration of Conformity
Hereby, Garmin declares that this GPSMAP640 product is in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC. To view the full Declaration of Conformity, go to the Web site for your Garmin product at


Problem/Question My GPSMAP640 never gets satellite signals. My GPSMAP640 does not charge in my vehicle. Solution/Answer Take your GPSMAP640 out of parking garages and away from tall buildings and trees. Remain stationary for several minutes. Check the fuse in the vehicle power cable (see page 73). Ensure the vehicle is turned on and is supplying power to the power outlet. Your GPSMAP640 can only charge between 32F and 113F (between 0C and 45C). If the GPSMAP640 is placed in direct sunlight or in a hot environment, it cannot charge. Hold your finger on the lowerright corner of the GPSMAP640 screen while it is turning on. Keep your finger pressed until the message appears. Touch Yes to clear all user data. Allow the unit to fully discharge, and fully charge it (without interrupting the charge cycle). Calibrate the touchscreen as described on page 33. When your GPSMAP640 is in USB mass storage mode, a picture of a GPSMAP640 connected to a computer is shown. Also, you should see two new removable disk drives listed in My Computer.
Software License Agreement
BY USING THE GPSMAP640, YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS OF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT CAREFULLY. Garmin grants you a limited license to use the software embedded in this device (the Software) in binary executable form in the normal operation of the product. Title, ownership rights, and intellectual property rights in and to the Software remain in Garmin. You acknowledge that the Software is the property of Garmin and is protected under the United States of America copyright laws and international copyright treaties. You further acknowledge that the structure, organization, and code of the Software are valuable trade secrets of Garmin and that the Software in source code form remains a valuable trade secret of Garmin. You agree not to decompile, disassemble, modify, reverse assemble, reverse engineer, or reduce to human readable form the Software or any part thereof or create any derivative works based on the Software. You agree not to export or re-export the Software to any country in violation of the export control laws of the United States of America.

How do I clear all my user data?
My battery gauge does not seem accurate. The touchscreen is not responding to my touches. How do I know my GPSMAP640 is in USB mass storage mode?
GPSMAP640 Owners Manual75
Appendix Problem/Question My computer never detects the GPSMAP640 when I connect it. Solution/Answer 1. Unplug the USB cable from your computer. 2. Turn off the GPSMAP640. 3. Plug the USB cable into a USB port on your computer and into your GPSMAP640. The GPSMAP640 automatically turns on and goes into USB mass storage mode. Ensure your GPSMAP640 is connected to a USB port and not a USB hub. If you have several network drives mapped on your computer, Windows can have trouble assigning drive letters to your GPSMAP640 drives. See your operating system Help file to learn how to map or assign drive letters. 1. Touch Where To? > Near > A Different City. 2. Find the hotel, and touch Go!. 3. Touch Menu > Where To? > Near > My Destination. 4. Search for a restaurant. Restaurants nearest your hotel are listed first.
Messages and Alarms (Marine Mode)
Alarm Clockthe alarm clock alarm has sounded.
AIS: Dangerous Targetan AIS target currently presents a collision threat. Anchor Drag Alarmthe boat has drifted out of the user-set distance range. Antenna Input is Shorted there is a short in the wiring to the internal or external antenna. Approaching Waypoint <name>the boat is a specified alarm distance from the destination waypoint. Arrival Alarm <name>arriving at destination waypoint. Auto-guidance unable to calculate route(BlueChart g2 Vision) auto-guidance cannot calculate the route. Ensure that both your current position and the end point are contained in the BlueChart g2 Vision region contained on the inserted SD card. Auto-guidance unable to calculate route. Ending position not within safe depth(BlueChartg2Vision) auto-guidance cannot calculate the route; choose an end point within the specified safe depth.
I cannot see any new removable drives in my list of drives.
How can I find restaurants near the hotel I will be staying at in the future?
Auto-guidance unable to calculate route. Starting position not within safe depth(BlueChartg2 Vision) auto-guidance cannot calculate the route; travel to water within the specified safe depth. Auto-guidance unable to calculate route, please shorten route (BlueChart g2 Vision) auto-guidance cannot calculate the route; choose a closer end point. Cant Read User Cardcannot read card when attempting a user data transfer. Cant Unlock Mapsmaps are locked and cannot be used on this unit. Cant Write User Card cannot write card when attempting a user data transfer. Check XM AntennaXM antenna is not connected. Check connectivity. Database Errorgeneral database error. Contact product support. Deep Water Alarm(sonar) the boat has entered the user-defined value for deep water. Directory Item With This MMSI Already ExistsMMSI unit is already in the directory.

Track Log Fullthere is no longer any space in the active track log storage. Track Memory is Full, Cant Create Trackthe saved track memory is full. Track Truncatedsome points on the end of the track have been discarded. Transfer Completeuser data transfer is complete. Unknown bridge height within calculated auto-guidance route(BlueChart g2 Vision) there is an unknown bridge height within auto-guidance route. User Card Not Founduser data card transfer. Make sure an SD card is fully inserted. Warning: Auto-guidance route starting position moved due to safe depth settings(BlueChartg2Vision) auto-guidance has calculated the route, but the start point has been moved to deeper water. Warning: Auto-guidance route ending position moved due to safe depth settings(BlueChartg2Vision) auto-guidance has calculated the route, but the end point has been moved to deeper water.
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Water Temperature Alarm(temperature sensor/transducer) the water temperature has entered or left the user-defined water temperature alarm zone. Waypoint Already Existsthe named waypoint already exists. Choose another name. Waypoint Memory is Full, Cant Create Waypointthe User Waypoint memory is full. Erase existing waypoints to make room.

Symbols A

2-D, 3-D map view 67 accessories 74 additional maps 73 addresses 56 add turn 16 AIS 31, 37 alarms 76 deep water 36 fish 36 shallow water 36 sonar 36 system 36 water temp 36 antennas 69, 70 attaching a photo to a location 58 audio version 66 auto guidance 11, 38 automatic magnetic variation 34 avoiding road types 66 theft ii
battery 72 status 5 battery information 72 beeper options 33 blend 13 BlueChart 11 brightness 67 browsing the map 59 buoy reports 52
course up 42 current location, save 58 current stations 27
Favorites 58 files 6364 deleting 64 background color 66 supported types 63 backing up data 29 GPSMAP640 Owners Manual81
caring for your GPSMAP 640 ii category (XM) 39, 53 celestial information 28 channel entry (XM) 39, 53 channel guide (XM) 38, 53 charging your GPSMAP 640 73, 75 charts Fish Eye 3D 8, 11 fishing 8, 11 navigation 8 Perspective 3D 8, 10, 11 coastal observation stations 52 cold front 50 colors 44 Mariners Eye 3D 44 communications settings 35 configuring 5, 54 coordinates 60
data transfer 29 Declaration of Conformity 75 deleting all user data 72 character 57 Favorites 58, 59 files 64 recent finds list 58 route 59 depth 34 detail maps 68 detour 55 display settings 66 driving directions 61 DSC 31, 37
finding places 6, 55 by address 56 by name 57 by postal code 56 near another location 57 recent selections 57 saved places (Favorites) 58 fishing 41, 51 flash flood warning 49 flood warning 49 forecasts (weather) 49 fronts (weather) 50 fuse, changing 73
elevation unit settings 34 event log 34 extras 7475


Technical specifications

Product TypeChartplotter
Width5.9 in
Depth1.9 in
Height4 in
Weight17.3 oz
GPS System
Recommended UseMarine, automotive
InterfaceNMEA 0183
VoiceVoice command recognition
FeaturesAlarm, 2D / 3D map perspective, XM weather support, custom POIs
Supported Memory CardsSD Memory Card
Maps IncludedCanada, USA, Puerto Rico
Software IncludedGarmin Worldwide Marine Basemap, Garmin City Navigator North America NT
Compatible GPS SoftwareBlueChart g2 Vision
Tracklog Points10000
Trip ComputerSun/moon positions
Built-in Display
Resolution800 x 480
Diagonal Size5.2"
Color SupportColor
FeaturesTouch screen
Connector TypeAntenna Headphones / line-out
TechnologyLithium ion
Run Time (Up To)9 hour(s)
Included AccessoriesProtective cover, AC power adapter, power/data cable, marine mount, USB cable
Waterproof StandardIPX7
Universal Product Identifiers
Part Number010-00696-40



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