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Garmin GPSMAP 378

Garmin GPSMAP 378
alaScore 78

71 reviews

Aug, 2018

alaTest has collected and analyzed 71 reviews of Garmin GPSMAP 378. The average rating for this product is 4.1/5, compared to an average rating of 4.0/5 for other GPS for all reviews. People are impressed by the performance and screen. The maps and price also get good views, but there are some mixed reviews about the durability.

usability, price, maps, screen, performance

We analyzed user and expert ratings, product age and more factors. Compared to other GPS the Garmin GPSMAP 378 is awarded an overall alaScore™ of 78/100 = Good quality.

Review analysis

(Based on 71 reviews)

1 expert reviews

User Reviews  

Showing 62 review(s)

Expert Reviews User Reviews


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Showing 1 - 62 of 62 Show Reviews: in English | in other languages (9)

Consumer review ( review summary for Garmin GPSMAP 378


alaTest has collected and analyzed 43 user reviews of Garmin GPSMAP 378 from The average user rating for this product is 4.0/5, compared to an average user rating of 3.9/5 for other GPS on Comments about the size and screen are generally positive. The maps and price are also mentioned favorably. There are some mixed views about the performance, while some have doubts about the durability.

usability, price, maps, screen, size


91% of the reviews on give this product a positive rating.

This summary is based on the products: Garmin GPSMAP 62 Handheld GPS WorldwideGarmin GPSMAP 62 Handheld GPS Worldwide

Aug, 2018

Consumer review ( review summary for Garmin GPSMAP 378


alaTest has collected and analyzed 14 user reviews of Garmin GPSMAP 378 from The average user rating for this product is 4.1/5, compared to an average user rating of 4.0/5 for other GPS on Reviewers really like the performance. Comments are divided on the durability, and many are less positive about the usability.



100% of the reviews on give this product a positive rating.

This summary is based on the products: Garmin GPSMap 378 GPS Navigator and ChartplotterGarmin GPSMap 378 GPS Navigator and Chartplotter

Aug, 2018

Expert review by : Sal Cangeloso (

Review: Garmin GPSMAP 62 handheld GPS device


Garmin's GPSMAP 60 series is practically the standard by which all other handheld GPS devices are measured, at least at the enthusiast level. The product was released about five years ago and still is popular today, so you can bet its follow-up is a...

Aug, 2010

Consumer review (



This is a very nice unit for the auto and boat. I had it about 3 weeks now and used it on long trips and performed well. Only problem that I have is that the voice sounds distorted so I will ask Garmin a replacement. Tiger GPS customer service etc is...

Oct, 2007

Consumer review (



Makes on water Travel Easy, also helps to get back to the Hot Fishing Spots. On the road, Tells you the Intersections coming up, Great at night, or when the Locals have removed the street signs!

Sep, 2007

Consumer review (

Multi-Purpose GPS For The Car And Boat


I have used several different GPS devices over the years and Garmin builds some of the best automotive and boating units you can buy. My latest purchase was the Garmin GPSMAP 640. Although expensive, this unit packs plenty of features with the weekend ...

Built in maps. Auto and marine capable

Poor speaker. Expensive. Optional maps expensive

Apr, 2010

Consumer review (



Un super produit. Bonne ergonomie, bonne autonomie.Très bonne acquisition et une lisibilité plein soleil sans problème.Menus remaniés, prise en main facile. Possibilité de rentrer des cartes géo-référencées.Compas trois axes précis.Le TOP.

Nov, 2010

Product Specifications

Go from box to boat to dash with the portable and versatile GPSMAP 378. This combination color chartplotter and land navigator comes preloaded with maps for lakes throughout the continental U.S., in addition to detailed street-level mapping. The ability to conveniently add plug-in data cards lets you easily add more maps and features - making this one incredible GPS navigator for land and fresh water. From curbside to dockside, the GPSMAP 378 has you covered - no downloads or computer required. Its preloaded inland lake maps boast 10-meter resolution for more than 3200 lakes - many with depth contours. In addition, these built-in fresh-water 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 comes preloaded with City Navigator NT detailed street maps for North America and includes 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 a snap to transfer the unit from boat to car. See real-time weather displayed on the 378's high-resolution 256-color sunlight-readable TFT display. 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 - so you can spend more time enjoying the water and less time worrying about the weather. The GPSMAP 378: loaded for fresh-water fun, right out of the box.


Color of product:Black
Form Factor:Handheld


Display Resolution:480 x 320
Display size (HxV):3 x 2.2
Display size (HxV) (imperial):3 x 2.2

Energy Management

Battery life (max):9
Battery Technology:Lithium-Ion (Li-Ion)

GPS Performance

Acquisition times - autolocate:300
Acquisition times - cold:45
Acquisition times - warm:15
Channels quantity:12
DGPS accuracy - position:118.1
DGPS accuracy - velocity:0.05
GPS accuracy - position:590.6
GPS accuracy - velocity:0.05
Update rate:1
WAAS capability: Yes

GPS Type

Auto: Yes
Aviation: No
Geocaching (GPS stash hunt): No
Marine (chartplotters, sounders): Yes
Outdoor (hiking, trekking): No
Sport (fitness, running): No

GPS type



Audible alarm(s):Y
Audible Alarms: Yes


Voice maps: Yes


Position format:Lat/Lon, Loran TDs, Maidenhead, MGRS, UTM/UPS
Routes quantity:50
Tracks quantity:20


Bluetooth: No

Operational Conditions

Operating temperature (T-T):-15 - 50
Operating temperature range (T-T):-15 - 50

Other Features

Power Requirements:11 - 35v DC


Battery life (max):9
Battery Technology:Lithium-Ion (Li-Ion)

Technical Details

Color of product:Black
Form Factor:Handheld
Number of Waypoints:3000

Weight & Dimensions