GPS for documented swims
I see a lot of people that use a SPOT gps device but I have also seen a few Garmin 910XT or 920XT wearers out there.
Am I correct in that the SPOT devices are utilized on the escort boat or kayak only?
I have the Garmin 920XT watch which I use for my open water training. Can I use that to record the GPS data? If so, do I need to modify it (put some tape over the display) or have it in a certain mode to qualify as an unassisted marathon swim?
Any clarification would be appreciated.