No strings - at all? then perhaps you should take TrishTash or even Juffy (who has changed his name in case he's going to sneak up on you) out and show them how to do it.
I'm pretty sure I couldn't find checkpoints without a string!
I wish all orienteering courses had a nice string for me to follow! I'm looking forward to Edmund showing me "How to Orienteer" and comparing splits some days in the future when he's going to start smashing us all on course. :P