MacENC (and very soon GPSNavX) supports various units in the MacENC preferences. One can select "nautical miles" or "nautical miles/yards" or "nautical miles/meters" for the distance units. In the latter two selections yards or meters will be displayed when the distance is less than one nautical mile.
Maybe I missed this in the help files for GPSNavX.
It would be very nice to be able to have various sets of waypoints and routes that one could switch to on the fly.
For instance I have a bunch of dive sites and a buch of navigations sites, and now looked at importing a GPX file of tide/current stations. The result is sort of a mess.
Just in terms of waypoints it would be nice to keep say my Canadian cruise north waypoints off the chart if I'm cruising south, etc.
Jack