relative-gps coord system

sys/etc/scripts/moveTo

@@ -5,13 +5,10 @@ turtle.run(function()
 
   local id = {COMPUTER_ID}
 
-  local pt = GPS.getPointAndHeading()
-  if not pt or not pt.heading then
+  if not turtle.enableGPS() then
     error('turtle: No GPS found')
   end
 
-  turtle.setPoint(pt)
-
   local socket = Socket.connect(id, 161)
   if not socket then
     error('turtle: Unable to connect to ' .. id)