Spot Tracker

Anyone using one yet? I got one for other purposes, but figured I may as well take it with me when I go riding.
I did the Oaks on Friday and Andersons / Oaks today. Both times it tracked me down the Oaks perfectly, but today it totally missed Andersons.

Has anyone else been using one of these and had large bits of missing data? Mine is the newer Spot2, however it does need to go back for replacement due to some battery life recall. I had great success using it in the deserts of California, just confusing why it didn't work today.

http://share.findmespot.com/shared/faces/viewspo...