The NAV will have the better mapping. Also register the unit and look for down loads, Hummingbird released a software upgrade last week to add HD downscan to the units. It took about 5 minutes to download the update to the PC, copy to SD chip and upgrade unit.
Before you spend the money on the jack plate see if you dont get suggestions here. If you do not get any help (would be hard to belive) contact BCB direct.
GAPuma, I appreciate what you do, and I know others do also. Try not to have too much fun in the sand and sun. My brother is back, he said the fishing is lousy and he did not see any BCBs. Be careful.