We already have software to do this, although it is on a PC rather than on the water with the unit.
HB probably won't be long with their own version, if history is any indicator.
Unfortunately for the 2 map suppliers, having this capability on the unit will demonstrate pretty convincingly how poor some of the "HD" maps really are, particularly in shallower waters. You are going to see a lot of structure that does not appear on any map, and the map is going to indicate structure that clearly does not exist.
Should be interesting.....