Well that depends what you want to do. ActiveCaptain (for marine charts), BaseCamp and MapInstall (for land maps) are the current programs Garmin promotes for working with their map products. Note that they don't supply marine charts in an installable form like they do maps for automotive use (such as .GMAP folders) and i think you realize that modern BCs are only supplied in *.img files, that leaves you having to reverse-engineer them to work with them in HomePort (or a very old version of MapSource). ActiveCaptain is an andoid & apple app. To use it on PC you'll need an emulator, like BlueStacks for Android. But never having used ActiveCaptain i really don't know its full capabilities.
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