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Garmin GPS III Plus

Garmin GPS III Plus
alaScore 68

21 reviews

Aug, 2018

alaTest has collected and analyzed 21 reviews of Garmin GPS III Plus. The average rating for this product is 4.3/5, compared to an average rating of 4.0/5 for other GPS for all reviews. Reviews about the durability and usability are on the whole positive, whereas there are some negative reviews about the memory and screen.

usability, durability

price, screen, memory

We analyzed user and expert ratings, product age and more factors. Compared to other GPS the Garmin GPS III Plus is awarded an overall alaScore™ of 68/100 = Good quality.

Review analysis

(Based on 21 reviews)

User Reviews  

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Consumer review ( review summary for Garmin GPS III Plus


alaTest has collected and analyzed 11 user reviews of Garmin GPS III Plus from The average user rating for this product is 4.5/5, compared to an average user rating of 4.0/5 for other GPS on Opinions about the screen and usability are generally positive, whereas some have doubts about the price.

usability, screen


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

This summary is based on the products: Garmin GPS III Personal NavigatorGarmin GPS III Personal Navigator

Aug, 2018

Product Specifications

Garmin's GPS III Plus offers cartographic capabilities formerly found only in high-end automotive navigation and marine chartplotting units. Simply plug it into a PC and download an extra 1.44 MB of map data from Garmin's line of MapSource CD ROM's to give you instant detailed maps. Whether you're cruising the streets or pounding the waves, Garmin has the maps you need. Choose the U.S. Roads and Recreation CD for city street level detail and even inland marine features such as lake and river shorelines, boat ramp and marina locations. Other CD's give you worldwide coverage of coastlines, including a database of coastal cities, navaids and inland roads. Even without additional cartography, the basemap in the GPS III Plus will get you where you're going. More than 10, 000 new towns have been added to the permanent basemap, as well as airport locations, secondary roads in metro areas and even detailed exit information for the federal interstate highway system, including information about available lodging, food and service stations.


Run Time (Up To):36hour(s)

Built-in Display

Resolution:100 x 160

Dimensions & Weight



Display Resolution:100 x 160
Display size (HxV):2.2 x 1.5
Display size (HxV) (imperial):2.2 x 1.5

Energy Management

Battery life (max):36

GPS Performance

Acquisition times - autolocate:300
Acquisition times - cold:45
Acquisition times - warm:15
GPS accuracy - position:15m RMS
GPS accuracy - velocity:0.1
WAAS capability: No

GPS Software

Maps Included:Alaska / Canada / Central America / Mexico / South America / USA

GPS System

GPS Functions / Services:Bearing / Distance / Electronic compass / Heading / MOB (Man Overboard) / Speed / Time/date/Bearing / Electronic compass / MOB (Man Overboard) / Time/date/Electronic compass / MOB (Man Overboard) / Time/date
Receiver:12 channel
Recommended Use:Automotive / Hiking / Marine
Type:GPS receiver

GPS Type

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


Model:III/III Plus
Packaged Quantity:1
Product Line:Garmin GPS


Audible alarm(s):N
Audible Alarms: No


Barometric altimeter: No
Electronic compass: No
Position format:Lat/Lon, Loran TDs, MGRS, UTM/UPS
Routes quantity:20
Tracklog Points:1900/2000
Waypoints per route:30

Other Features

Additional map options:N/A
Antenna Type:Detachable, Standard BNC connector
Basemap: No
GPS receiver:12 channel
Interface:NMEA 0183 & RTCM 104 DGPS corrections
Internal memory:1.44
Number of tracklog Points:1536
Waypoints per Route:50


Battery life (max):36

Technical Details

Number of Waypoints:500

Weight & Dimensions