Buying
Wednesday, August 26th, 2009
According to Charlie Lee of Ezine articles (http://ezinearticles.com/?expert=Charlie_Lee), “A marine gps navigational unit needs to use at least 12 of the 24 satellites calculating your position. All 24 would be the best, of course. And a larger screen for reading and viewing the water below the boat would be ideal.”
Smaller units are ideal for personal use and would not risk the safety of a whole ship, however, if you are buying a system for the latter, you need to shell out some money and invest on something that is more advanced and bigger such as a 7-inch toushscreen LCD.
http://ezinearticles.com/?How-To-Find-The-Best-Marine-GPS-For-Your-Boat&id=1037870