In any event loops are risky and likely to be short cut. Don't be too tricky at first. Remember, the pack is very stoopid, and will not be able to fathom anything too subtle. Never, never apologize. Everyone who complains has done far worse.
Checks are circles.
If you set a false trail of more than three marks, put down an F at the end. Simple arrows may be real or not, it's up to you. Use these to cross immense fields, boiling streams, the Atlantic Ocean, whatever. The Nuclear Football - home of Clem and his dog 2.