OK, after getting completely cheesed off trying to take bearings with the good old Silva Type 3, I finally bit the bullet and bought a better sighting compass - the Ranger 27. Now apparently this compass includes a sundial... I can plainly see the markings on the bottom of the baseplate, but I can't for the life of me figure out how you'd actually use it. And of course the instructions supplied are completely silent on this point... Anybody know how?