Help with making program sp and chunk unloading proof?

A cool guy called kaikaku:

https://www.youtube.com/channel/UCyoixsV9m9y_DETZczw760A

made this program here: http://pastebin.com/JgRgRK5q

for a tree farm.

I was wondering how would one make this not break when logging out in sp and also how to prevent it breaking when the chunk unloads. His solution for logging out in sp is to make the turtle wait if it is receiving a redstone signal at the end of a cycle. So basically if you know you are going to log out soon, activate the redstone signal. I am wondering if there is a better way to do this such as when the turtle reboots go to the starting coords of the farm and then run the program as usual.

Any help is appreciated and thanks in advance

My solution for my chopper has been to set up a GPS at world height. When the turtle reboots, it hence knows exactly where it is, can go back to its "proper" starting position, and then resume as normal from there.

I made (..or rather, updated) an API which tracks the movement of a turtle here, which you could use to know where the starting coords are, relative to where the turtle is now.

KingofGamesYami, on 15 December 2015 - 01:11 AM said:

I made (..or rather, updated) an API which tracks the movement of a turtle here, which you could use to know where the starting coords are, relative to where the turtle is now.

Bomb Bloke, on 15 December 2015 - 01:10 AM said:

My solution for my chopper has been to set up a GPS at world height. When the turtle reboots, it hence knows exactly where it is, can go back to its "proper" starting position, and then resume as normal from there.

Thanks. Can this also be applied to the chunk being unloaded?

Yes, I have never successfully confused my API. Although, I'm not sure if it'll handle a server crash - never tested it.