I use Garmin's POI loader and GSAK to load thousands of geocaching POI's (points of interest) into the Garmin GPSmap 60CSx. It is a neat trick that lets you use customer geocaching icons and have cache page details available on your GPSr. I have been doing this for years...Until a few days ago!
invalid string positionThis is the error message I received when the POI loader was transferring the data to the GPSr. Nothing I did solved the problem. Garmin technical support's suggestion was to just quit using the POI feature. Since this was unacceptable, I finally used Google to search and develop a theory on how to fix the problem.
It seems that the newest version of Garmin's POI loader doesn't handle invalid string data well. I finally installed an older version of the POI loader and the problem was solved.
Here is a link to a more detailed experience with Garmin's technical support and the solution to the problem:
http://carolinacacher.blogspot.com/2010/07/garmin-technical-support-as-good-as.html