Homeport and Basecamp can display locked maps on pc.
With Homeport just Bluecharts in :SD/Garmin /The file name(s) might be something like "VPC410S.img" instead of the common "gmapsupp.img". Usually one per sd, but there is a workaround:
read Ballebar post n3 here
[Only registered and activated users can see links. ]
Basecamp : topo and car routable maps SD/Garmin /anyname.img
Mapsource cant display modern Bluecharts-
The map above shows:
Shows inland waterways, including freshwater lakes, creek channels, streams, islands and more.
Includes navigational aids and routes.
Displays wrecks, obstructions and hazards.
Features locks, jetties, fishing locations as well as lake and river shorelines.
Includes searchable lakes, cities and geographic points.
.....and nothing else, just the lakes and some points.
Small pictures are from Garmin product page
If you install BCs in Mapsource with Gmaptool Homeport wont see them.
Gmaptool can install maps in Mapsource ,but not sure you'll have all the BC features, and frankly ,unless you must print a route, I dont guess any advantage of using Mapsource instead of Homeport for BCs-
Homeport is made for Bluecharts, Mapsource for Nuvi's maps-