Product DescriptionGARMIN GPSMAP-640 Car Marine GPS. Garmin International is pleased to announce the new GPSMAP 620 and GPSMAP 640. These two new Garmin products offer elements of the GPSMAP 5000 series marine chartplotters combined with elements of the popular nuvi series for use on the road all in one easy to use device. Portable and powerful, the GPSMAP 620 and GPSMAP 640 feature a high sensitivity GPS receiver and boast a large, super bright 5.2 in WVGA touchscreen display that reacts as users tap and drag through the intuitive user interface. Out of the box, the GPSMAP 640 comes complete with marine and automotive mounts. This true land and sea navigator features preloaded maps such as highly detailed BlueChart g2 marine cartography of the coastal United States /including Alaska, Hawaii and the Bahamas/ as well as highly detailed City Navigator NT road maps for North America.
Garmin GPSMAP 640 Waterproof Car/Marine GPS and Chartplotter (With BlueChart g2 Marine Charts and City Navigator NT North America Maps) So I bought this unit for one purpose, to use it on boats in my boat club. I currently own many of Garmin's products, from nuvis on the street to a GPSMAP 4208 on my own boat. This is a great little GPS. I have been using it in the car until the weather warms up and I can use it in the boat. I would not recommend using the included friction mount. RAM has an awesome windshield mount that works great. As far as functions and usability, I have no issues, everything is where it is on my Nuvi in auto mode and marine mode on my GPS MAP 640. I have a G2 Vision card that I use in my 4208 and I put it in the 640 and I get all the additional map features missing from the base map. For the reviewer who posted about the navigating function moving over land while in the water, that is because you need the G2 Vision card to use auto guidance. I would recommend this GPS to others who need a portable GPS.
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