I've can't figure why anyone would want a
device with a sounder and inland charts? Either something they did to
confuse people like James OR a decision taken by the same Garmin fool that
decided to disable the tracking function in the PC version of Mapsource when
connected to a Garmin device.


Why not? We have many lakes, and lots of them are not well mapped.

I don't understand what changes Garmin made in Mapsource. Anyone?