GPS Summoner Turtle

rednet.open("right")
senderId, message, distance = rednet.receive(3)
if distance == nil then
print("Could not locate")
sleep(2)
os.shutdown()
end
olddistance = distance
turtle.forward()
senderId, message, distance = rednet.receive(3)
if olddistance > distance then
while true do
olddistance = distance
turtle.forward()
distance = rednet.receive(3)
if distance > olddistance then
break
end
end
elseif distance > olddistance then
distance = olddistance
turtle.turnLeft()
turtle.turnLeft()
turtle.forward()
senderId, message, distance = rednet.receive(3)
if distance > olddistance then
print("ERROR!")
sleep(2)
os.shutdown()
end

while true do
olddistance = distance
turtle.forward()
senderId, message, distance = rednet.receive(3)
if distance > olddistance then
break
end
end
end
print("Aligned. Hopefully.....")