Hi,
There is a version 6, but it will be the last one. I accidentially deleted the source code with a Ubuntu installer (formatting the wrong drive).
It still deals with GPSMAP 64 version 5.10, which looks like it’s still current, but if there’s ever an update for the 64 device, that won’t be supported.

New features are mainly a seperate user supplied image for every location that can be replaced. There’s a bit more, but I forget at the moment :D