I'm thinking of buying a hand-held GPS and a Navionics chip to go with it. I like Garmin76CSx, but from what I understand it's not compatible with Navionics. That leaves me with Lowrance H2Oc. My concern at this point is the puny size of the screen on any hand-held devices. So the question is: can you read the chart on a hand-held GPS reasonably well, as in hey, this is rather useful, rather than, geez, what a waste of money? Any input would be very much appreciated.