Garmin GPSMAP 640

alaTest has collected and analyzed 26 user reviews of the Garmin GPSMAP 640 from Amazon.com. The average user rating for this product is 3.5/5, compared to an average user rating of 4.0/5 for other products on Amazon.com.

Easy to use. I like the touch screen feature. I use it as a supplement to my primary Chartplotter. It has many features and is very reliable.

The Garmin GPSMAP 640 is a flexible device that allows me to have a GPS on board my boat while also being available for car usage. Although we have GPSs in both our cars now, we plan to use the 640 when traveling with a rental car. We are even planning...

I work as an Amazon river pilot and, therefore I only use the GPS in the marine mode and as a navigation aid in piloting. I have been using for a long time for that purpose the Garmin 276. This GPS is very good but does not have a high sensitivity...

I have been boating on and off for several years. I decided to purchase a boat for the family. Having 2 small children I decided to err in the side of caution and purchase a GPS/Chart Plotter. I found in using many units this one has alot to offer with...

I picked up this unit for a 23 foot boat, because I wanted something portable.

I picked up this unit for a 23 foot boat, because I wanted something portable. I read all the negative reviews, and wondered what the reason could be. Should I purchase an older portable Garmin unit? After all, the 276c gets a lot of praise. After...

Garmin GPSMAP 640 Waterproof Car/Marine GPS and Chartplotter. It misses too many normal options, in navigating and still has an enormous bug in the "Velocity Made Good" showing. It is a new instrument but lacks nmea2000 connection ,just nmea183. That...

I bought the GPSMAP40 for my 24" sail boat. First disappointment is the battery life. Even in low brightness (<30%) it holds 5 hrs max when it was sold for 9. The good point is that we can configure alarms (drifting on anchor ...) but there is no...

I bought the GPSMAP40 for my 24" sail boat. First disappointment is the battery life. Even in low brightness (<30%) it holds 5 hrs max when it was sold for 9. The good point is that we can configure alarms (drifting on anchor ...) but there is no...