Re: PC Chartplotter advice?
We're using Navionics HD on an I pad, next step is to get a GPS puck (the pad is wifi only). It's a $50 app and covers the Americas, have downloaded all the areas between Victoria and the Central coast, charts look great.
"Bad Elf" is one of the popular GPS modules, and there's another, cheaper but 'blind' (ie no display on the 'puck'), Dual XGPS150, and Garmin GLO are candidates. The Elf and XGPS communicate with the pad via bluetooth, that may work for you too.
We also put the pad into a 'hardened'/water resistant case for use in the cockpit. Even though we used it only as a planning tool and the odd time we were without the paper chart, it worked well. We do have another plotter in the cockpit.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)