FWIW my Garmin StreetPilot ColorMap (not a StreetPilot III, sadly) will output a valid altitude, but never reports a 3D fix, so GPSapp keeps the altitude dimmed.

I admit it's a bit odd to see "2D 8SV"

That's another thing...it's a 12-channel receiver, and will claim 9 or 10SVs on it's own display, but still only reports 8 through NMEA.

No matter, if I ever get time to work on the TINI gps board, I'll stop needing the StreetPilot in the car. (Who'd have thought I'd have *less* time since I got laid off. )