function gps()
x,y,z=gps.locate(2,false)

function pumpkin()
  gps()
  if z ~= -53 then
    if z < -53 then
      turtle.turnLeft()
      while z~=-53 do
       turtle.forward()
       gps()
      end
      turtle.turnRight()
    else
      turtle.turnRight()
      while z~=-53 do
       turtle.forward()
       gps()
      end
      turtle.turnLeft()
    end
  end
  turtle.select(16)
  while turtle.compareDown() do
    turtle.dig()
    turtle.forward()

while true do
  rednet.open("right")
  sender,message=rednet.receive()
  if message == "pumpkin" then
    rednet.send(sender,"pumpkingoing")
    pumpkin()
  end
end