relative-gps coord system

sys/etc/scripts/follow

@@ -1,20 +1,16 @@
 local function follow(id)
 
   require = requireInjector(getfenv(1))
-  local GPS = require('gps')
   local Socket = require('socket')
   local Point = require('point')
   local process = require('process')
 
   turtle.status = 'follow ' .. 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)

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)

sys/etc/scripts/summon

@@ -7,6 +7,7 @@ local function summon(id)
 
   turtle.status = 'GPSing'
   turtle.setPoint({ x = 0, y = 0, z = 0, heading = 0 })
+  turtle.getState().coordSystem = 'relative'
 
   local pts = {
     [ 1 ] = { x = 0, z = 0, y = 0 },