GPS software recommendation - going on a cruise.

[JeffKay]

I’m going on a cruise and would appreciate recommendations for a GPS software so I can see our position, mostly on the ocean and a bit on land. Basic world maps would be fine, nothing super detailed required. It must be self contained, internet will not be available, or when it is it’s at crazy international roaming rates. Last time I used my notebook with a Delorme software, that worked fine. Now that my phone has a GPS, it would be nice to have it “in hand”

Thanks in advance!
Jeff