detHead

local _tArgs={...}

fuel=turtle.getFuelLevel()
print(os.getComputerID(),": ",os.getComputerLabel())
print ("Fuel Level: ",fuel)
if fuel>0 then
  rednet.open("right")

if #_tArgs==2 and _tArgs[1]~=_tArgs[2]then
    pos1=vector.new(textutils.unserialize(_tArgs[1]))
    pos2=vector.new(textutils.unserialize(_tArgs[2]))
else
  pos1=vector.new(gps.locate())
  while turtle.detect()==true do
    turtle.turnRight()
  end
  turtle.forward()
  pos2=vector.new(gps.locate())
  turtle.back()
end

  posDelta=pos2-pos1

local  dirFile=fs.open("/nav/dir.tab","r")
local dirData=dirFile.readAll()
dirFile.close()
local dirTab=textutils.unserialize(dirData)

  if posDelta.x==0 and posDelta.z==-1 then
    direction=2
  elseif posDelta.x==0 and posDelta.z==1 then
    direction=0
  elseif posDelta.x==-1 and posDelta.z==0 then
    direction=1
  elseif posDelta.x==1 and posDelta.z==0 then
    direction=3
  end

  print("Current Position: ",pos1)
--  print(pos2)
--  print(posDelta)
--  print(posDelta.x)
--  print(posDelta.z)
  print("Heading: ",dirTab[direction])
  local data={pos1.x,pos1.y, pos1.z, direction}
--  for k, v in pairs (data) do
--    print (v)
--  end

  file=fs.open("/nav/gpsCoord","w")
  file.write(textutils.serialize(data))
  file.close()
  return direction
else
  print("No Fuel!")
  i=1
  while fuel==0 do
    for i=1,16 do
      turtle.select(i)
      refuel=turtle.refuel()
      if refuel==true then
        fuel=turtle.getFuelLevel
      end
      print("refuel: ",refuel)

      end
    end
  end