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Garmin GPSMap 378

No longer stocked. See more Garmin Marine GPS units here>

On land or water, you're ready to go...

The GPSMAP 378 is a portable and versatile combination colour chartplotter and land navigator which comes preloaded with maps for lakes throughout the continental U.S., as well as detailed street-level mapping. Weather and sonar capabilities are optional, and plug-in data cards let you easily add more maps and features - making this one incredible GPS navigator for land and freshwater.

Note: The GPSMap 378 is preloaded with US Inland Lakes and City Navigator NT maps. GPSMap 478 is preloaded with US coastal maps and City Navigator NT maps.

Preloaded and Portable
The GPSMAP 378 has you covered on land or water with no downloads or computer required. Its preloaded inland lake maps provide 10-meter resolution for more than 3200 lakes - many with depth contours. In addition, these built-in freshwater maps provide shoreline detail, river and creek channels, islands, boat ramps, campgrounds and more for tens of thousands of lakes across the continental U.S. - giving you the freedom to boat and fish anywhere in the states. These maps also show streams and rivers, tide stations and predictions, a wrecks and obstructions database, and U.S. Coast Guard aids to navigation.

For road trips, the 378 along with its saltwater counterpart, the GPSMAP 478, come preloaded with City Navigator NT detailed street maps for North America and include automatic routing with voice guidance along with an industry-leading database with more than six million points of interest - including hotels, restaurants, gas stations, marinas, attractions and more. These street maps are seamlessly integrated with the 378's lake maps. An included marine mount and automotive kit make it easy to transfer the unit from boat to car.

Up-to-date Weather
Real-time weather can be displayed on the 378's high-resolution 256-colour sunlight-readable TFT display with the purchase of the GXM 30 antenna (sold separately) and subscription to XM WX Satellite Weather. View vital weather data, such as NEXRAD radar, storm cells, wind speeds, surface temperatures, forecasts and more than a dozen other weather attributes directly on the unit's display.

With the GXM 30 antenna, you also have the option of receiving XM Satellite Radio's 150 plus channels of commercial-free music, sports, news, talk and entertainment programming. Weather and audio options travel with your plotter, whether you're navigating on land or sea.

XM Satellite Weather and Radio in Canada
Watch for details of availability of XM weather services in Canada or contact
XM WX Satellite Weather
In Canada, the XM service is made available through XM's exclusive licensee, Canadian Satellite Radio Inc. (go to for the Canadian channel listing, online radio offerings and to subscribe). XM provides excellent coast-to-coast signal coverage to the densely populated regions of Canada through its satellites and a robust ground repeater network installed in major metropolitan areas.

Sonar Capability
The 378 can be paired with the GSDT 21 remote sounder module to add sonar capability. The GSD 21 is Garmin's "black box" sounder, which offers 4,000 watts of power peak-to-peak (500 watts RMS) in a dual-frequency transducer (purchased separately).

Plug-and-play Additional Mapping
Optional software available on plug-in Garmin data cards, lets you instantly add new maps to your GPSMAP 378 - without connecting to your computer. BlueChart g2 cards provide exceptional offshore detail, port photos and more for marine use. Easily customize map data for your adventures on land or sea with Garmin's
optional MapSource cartography.

*Because of the unique way the map data has been combined and loaded, the Garmin GPSMAP 378 is not compatible with Garmin's City Navigator NT North America DVD, which is sold separately. For example, if you use this City Navigator NT DVD to plan routes on your computer and transfer them to the Garmin GPSMAP 378, the unit will recalculate each transferred route.

GPSMAP 378 Features:
• Receiver: WAAS-enabled, 12 parallel channel GPS receiver
• Display: 3.8-inch diagonal, 480 x 320 pixel, 256-colour TFT screen with adjustable LED backlight
• Unit dimensions: 5.7"W x 3.2"H x 1.9"D
• Waypoints: Stores 3,000 waypoints and 50 reversible routes
• Tracks: 10,000 point automatic track log saves up to 15 tracks
• Battery life: Rechargeable lithium-ion battery offers 4 to 15 hours of use (4 hours with GXM 30 and 15 without GXM 30)
• Water resistant up to IEC 60529 IPX7 standards (submersible in one meter of water for 30 minutes)
• Preloaded inland lakes
• Built-in street navigation with voice prompts, using included cable and speaker
• Accepts the latest (optional) BlueChart g2 data cards
• Add optional GSD 21 for full-feature sonar capability
• Add optional GXM 30 antenna for XM WX Satellite Weather
• Provides tides and built-in celestial information
• NMEA 0183 input and output
• Removable quad helix antenna
• Single knob tilt/swivel mount
Check Garmin's On The Water Product Comparison for marine models

View Cart
user's manual
Unit's Accessories

bluechart g2 compatiblewaas enabled
xm satellite weather navtec on board

garmin gpsmap 378

Package Includes:
• GPSMAP 378
Preloaded U.S. Inland Lakes
Preloaded City Navigator NT North America (full coverage)
Trip & Waypoint Manager
USB/PC interface cable
Power/data cable
Marine mount
Automotive mount*
Universal friction mount
12-volt adapter cable with speaker
AC charger
Protective cover
Owner's manual
Quick reference guide

* NOTICE TO DRIVERS IN CALIFORNIA AND MINNESOTA: State law prohibits drivers in California and Minnesota from using suction mounts on their windshields while operating motor vehicles. Other Garmin dashboard or friction mounting options should be used. Garmin does not take any responsibility for any fines, penalties, or damages that may be incurred as a result of disregarding this notice. (See California Vehicle Code Section 26708(a); Minnesota Statutes 2005, Section 169.71)

Portable Plotter Links
GPSMAP 276C colour, accepts Garmin data cards, sonar capability, detailed basemap with autorouting
GPSMAP 376C colour, accepts Garmin data cards, sonar capability, detailed basemap with autorouting, weather enabled, GXM 30 included
GPSMAP 378 colour, accepts Garmin data cards, sonar capability, preloaded U.S. Inland Lakes & street maps, autorouting, weather enabled, automotive mount included
GPSMAP 478 colour, accepts Garmin data cards, sonar capability, preloaded U.S. marine detail with g2 & street maps, autorouting, weather enabled, automotive mount included

Garmin GPSMap 378

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