local turtleState = {};
turtleState.haveModem = function(self, right)
  if right == nil then
    right = true;
  end
  local modem = peripheral.find("modem");
  if modem == nil then
    for slot = 1, 16 do
      local itemDetail = turtle.getItemDetail(slot);
      if itemDetail ~= nil and itemDetail.name == "computercraft:peripheral" and itemDetail.damage == 1 then
        local oldSlot = turtle.getSelectedSlot();
        turtle.select(slot);
        if right then
          turtle.equipRight()
        else
          turtle.equipLeft()
        end
        turtle.select(oldSlot);
        modem = peripheral.find("modem");
        break;
      end
    end
  end
  return modem;
end

local area = {};
area.globalPosition = vector.new(0, 0, 0);
area.globalRotation = { x = vector.new(1, 0, 0), y = vector.new(0, 1, 0), z = vector.new(0, 0, 1) };
area.getLocalPosition = function(self, state)
  state:haveModem();
  local globalPosition;
  while globalPosition == nil do
    globalPosition = vector.new(gps.locate(10));
  end
  globalPosition = globalPosition - self.globalPosition;
  local localX = globalPosition:dot(self.globalRotation.x);
  local localY = globalPosition:dot(self.globalRotation.y);
  local localZ = globalPosition:dot(self.globalRotation.z);
  return vector.new(localX, localY, localZ);
end

print(area:getLocalPosition);