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Garmin GPSMAP 478

alaTest has collected and analyzed 225 reviews of Garmin GPSMAP 478. The average rating for this product is 4.4/5, compared to an average rating of 4.0/5 for other GPS for all reviews. Reviews about the screen and size are on the whole positive. The performance and price are also appreciated.

usability, price, performance, size, screen

We analyzed user and expert ratings, product age and more factors. Compared to other GPS the Garmin GPSMAP 478 is awarded an overall alaScore™ of 74/100 = Good quality.

Review analysis

(Based on 225 reviews)

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Consumer review by: ( review summary for Garmin GPSMAP 478


alaTest has collected and analyzed 219 user reviews of Garmin GPSMAP 478 from The average user rating for this product is 4.4/5, compared to an average user rating of 4.0/5 for other GPS on Comments about the route planning and screen are generally positive. The size and performance are also appreciated, whereas there are some critical opinions about the price.

usability, performance, size, screen, route planning


93% of the reviews on give this product a positive rating.

This summary is based on the products: Garmin GPSMap 478 GPS Navigator and ChartplotterGarmin GPSMap 478 GPS Navigator and Chartplotter

Jan, 2018

Consumer review by: Tony Moore (



Better instructions - more visual aids such as flow diagrams and decision trees would be helpful in navigating the instrument. I was very pleased with the ordering process and service from PC Nation and would definitely consider using you again.

Fairly compact device with tremendous capability. Works well as a marine navigational tool and as a highway map and route device. 12v plug with microphone works very well. While the price is high the capability and versatility of the device justifies...

It is complex and learning to use it effectively is difficult.

Sep, 2007

Consumer review by: Oby (

GPSMAP 479 Rev1


Own it since July 2006. Excelent for Marine navigation with the g2 chart Technology. Fast Calculation for Road navigation. Higway navigation display is only a line to follow and it is not displayed like i.e. NUVI 3D navigation(but good for marine...

Aug, 2007

Consumer review by: katrinakaif (

Super GPS


The new Garmin GPSMAP 378 and GPSMAP 478 portable GPS navigators have been announced, said to be the world's first portable GPS Navigators with pre-loaded Land and Sea cartography, comprehensive maps and charts. "Our customers want GPS navigators that...



Jan, 2009

Consumer review by: tdog (



I have had 2 TOM-TOMs, a SONY, and something else in 8 months. THIS is the only way to go.

Acquires Satellites Quickly, Compact, Easy Menus, Easy To Read, Easy To Set Up, Large Screen, Simple Controls

Oct, 2008

Consumer review by: krishna (

Nice GPS


Used the Web Updater from Garmin and had a problem where the g2 maps seemed to disappear. It was very easy to get a tech support rep on the phone who helped me turn off the automotive maps in order to see the g2 charts. For some reason, the updater...

Screen resolution is very good for its size


Oct, 2008

Consumer review by: Rosocorrecto (

There is a downside . . .


While the 478 is a powerful GPS, there is a downside. Battery life is very short and the repacement batteries are expensive. If I had it to do over, I'd buy Magellan.

Acquires Satellites Quickly, Compact, Easy Menus

Short Battery Life, Unreliable

Jul, 2008

Product Specifications

Go from box to boat to dash with the portable and versatile GPSMAP 478. This combination color chartplotter and land navigator comes preloaded with U.S. marine charts utilizing elements of the latest BlueChart g2 technology, in addition to detailed street-level mapping. Optional weather and sonar capabilities combined with the ability to conveniently add plug-in data cards, let you easily add more maps and features - making this one incredible GPS navigator for land and sea. PRODUCT FEATURES: 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.


Run Time (Up To):15hour(s)

Built-in Display

Diagonal Size:3.8"
Diagonal Size (metric):9.7 cm
Resolution:480 x 320


Color of product:Black
Form Factor:Handheld

Dimensions & Weight



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 System

Receiver:12 channel
Recommended Use:Marine
Type:GPS receiver

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



Packaged Quantity:1
Product Line:Garmin GPSMAP


Audible alarm(s):Y
Audible Alarms: Yes


Voice maps: Yes


Waterproof: Yes


Position format:Lat/Lon, Loran TDs, Maidenhead, MGRS, UTM/UPS
Routes quantity:50
Tracklog Points:10000
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