Bill Daniels wrote:
...
1, There are (n) gliders in close proximity - say 1 kilometer. Even simple
GPS broadcast devices should be able to determine the number of gliders
nearby. It should beep softly when the number changes. (If the device says
there are 3 gliders nearby and you can only see 2, you need to keep
looking.)


The GPS position itself should be optional. i.e. if a GPS is available and
a GPS position available from it, the device should send it, but in any
case send an ID of the glider (e.g. its registration number or its tail number,
or both), so that even if you don't know exactly where another glider is, you
know that there is a glider nearby, as the power of the device makes that
you receive only broadcasts from near gliders.