Ok, so I'll find something more useful to do.

I sent a patch to Jan for gpsapp which implements real time display of NMEA strings, but I'm not overly happy with it. He hasn't commented yet so either he's busy or he isn't either

I was going to try something with raster underlays for the gpsapp route screen, and worked out a way to color-reduce a geotiff using the USGS colormap standard to something which would display what I considered "interesting" information and punt the rest, and then actually thought to crop a 128x32 section and noticed it just wasn't large enough until I went to 4x zoom out.

Maybe I should play with trying to figure out saved tuner settings some more.