Plotting a maidenhead grid square in aprsisce
The WSPR protocol uses Maidenhead grid squares to plot location. The granularity of a 6-character grid square is approximate 3x4 miles, which is fine for WSPR balloons in the air. Unfortunately, if a payload crashes on the ground, it's not as useful. Twice, now, I've tried to locate a WSPR payload on the ground by driving around and trying to hear the signal. I find it useful to have Aprsisce running in my car, and plotting the grid square on the map, so that I know when I'm reaching the borders of the search area. Unfortunately, I can never remember how I did it. This blog entry is a "note to self" for the next time this comes up.
Convert grid square to KMLVisit this site, and enter the 6 character grid square. It outputs a .kml file.
Convert the KML file to a GPX fileVisit this site and conver the kml to gpx.
Load the GPX file as an overlay in aprsisceInside aprsisce: Configure / Overlay / Add GPX file...
Set the opacity and color so that it shows nicely on the map.