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Garmin GPSMAP 640

alaTest has collected and analyzed 50 reviews of Garmin GPSMAP 640. The average rating for this product is 3.7/5, compared to an average rating of 4.0/5 for other GPS for all reviews. Reviews about the durability and performance are generally positive. The size and screen also get good feedback. There are some mixed views about the route planning. Many are negative about the design and price.

usability, screen, size, performance, durability

price, design

We analyzed user and expert ratings, product age and more factors. Compared to other GPS the Garmin GPSMAP 640 is awarded an overall alaScore™ of 81/100 = Very good quality.

Review analysis

(Based on 50 reviews)

Expert Reviews  

User Reviews  

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Consumer review ( review summary for Garmin GPSMAP 640


alaTest has collected and analyzed 48 user reviews of Garmin GPSMAP 640 from The average user rating for this product is 3.7/5, compared to an average user rating of 4.0/5 for other GPS on Comments about the reliability and durability are overall positive. The performance and screen also get good feedback. Views about the route planning and size are mixed. There are some critical comments about the design.

usability, screen, performance, durability, reliability


73% of the reviews on give this product a positive rating.

This summary is based on the products: Garmin GPSMAP 640 Waterproof Car/Marine GPS and ChartplotterGarmin GPSMAP 640 Waterproof Car/Marine GPS and Chartplotter

Sep, 2018

Expert review by : (

Garmin GPSMAP 696 Aviation GPS Offers Split-screen Versatility


Big, high-resolution screen permits simultaneous map and instrument viewing., XM satellite weather radio and integrated weather display layer., High-resolution terrain alert features.

May have difficulty finding room for it in the cockpit., Study up and practice to master all of its features and controls.

Garmin takes portable aviation GPS to the next level with its GPSMAP 696 multi-function display (MFD) model. The 696 features a big (7-inches diagonal), bright, high-resolution display that can be operated in split-screen mode to display maps and...

Feb, 2013

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

Product Specifications

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.


RoHS compliance: Yes


Color of product:Grey
Form Factor:Fixed


Display Diagonal:5.2
Display Resolution:800 x 480
Display size (HxV):4.5 x 2.7
Display size (HxV) (imperial):4.5 x 2.7
Touch screen: Yes

Energy Management

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

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


Map storage:Internal storage
Map view options:3D


Compatible memory cards:SD


Automatic routing: Yes
Routes quantity:10
Voice commands: Yes


Bluetooth: No

Other Features

Basemap: Yes
I/O ports:NMEA 0183

Ports & interfaces

Headphone outputs:1


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

Technical Details

Color of product:Grey
Form Factor:Fixed
Hunt/fish calendar: No
Interface Type:Touch Screen
Number of Waypoints:1000
Sun & moon information: Yes
Tide tables: Yes

Weight & Dimensions