Check out the spot connect. It syncs to any smartphone through bluetooth and has only a fee of 99 for 500 messages. It looks pretty cool cause you can text email twitter facebook and use as epirb. It looks pretty simple. I have a buddy here who did this trip in a 15' boat with a single 115. He knows the trip well. I suggest that we collectively start a list of items and checks on the forum. Also what dates are you looking at?