I have got a magellan unit. which is fine as a back up and when off hill walking or on the bikes has full euro maps (road) and is water proof. but could not use it while under way in a chop. and it dose use batts at a fair lick. but as i am seldom in waters I don't know. But it has been dropped a good few times and had lived so it gets my vote cant remember the model number but I will see if I can get it. lent it to a mate so if he thinks it is good i might not see it.
“The only difference between men and boys, is the price and size of their toys”