Its not just Garmin
A GPS thats five years old might still work fine, but is pretty ancient gear right now. The machines AND the software have improved considerably, its just not viable to keep developing software that is scaled to their limitations. Its like complaining about the lack of new software for CPM or DOS systems. Navionics, CMap, Garmin, they've all moved on toward larger coverage, color, more detail, preloaded charts, overlays for radar and weather, 3D and satellite views, etc. Raymarine has switched to Navionics, which has come out with Gold+ and Platinum today. CMap's NT charts are not burned on machines that do NT+, and those are being outdated by Max. After all, they are little computers run by software, right?