For the record, a SPOT isn't a PLB. A PLB sends signals via 406 MHz to low earth orbit (among others) satellites and has a 121.5 MHz homing beacon.
A SPOT uses satellite phone technology, broadcasting in the L-band spectrum (1600 MHz range). A SPOT has no homing beacon.
I'm not saying the SPOT is horrible, but neither is it a true PLB.
Doug has written several pieces on the SPOT; you might want to check them out:
http://www.equipped.org/SPOT_ORSummer2007.htmhttp://www.equipped.org/blog/index.php?s=SPOThttp://www.equipped.org/blog/?p=73
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