Track

if not rednet.isOpen() then
  rednet.open("back")
end
while true do
  s, m, p = rednet.receive("track")
  if m == "getPos" then
    x,y,z = gps.locate()
    rednet.send(s,{ x = x, y = y, z = z}, "track")
    print("send "..x.." "..y.." "..z.." to "..s)
  end
end