What Software for navigation?
My favourite which I used exclusively offshore through my laptop was Waypoint for Windows which I just checked for and found at http://www.promarsoftware.com/ I don’t know if the latest version they are offering is the same as the one I had (Vs.2.04) but it was simple, gave me what I wanted and easily connected to my GPS and laptop. Alternatively, I could just enter the information from the GPS manually into the laptop and it gave me the essentials I wanted. It also printed up a nice record of all the days and navigation for the voyage.