JoeF, Thank you.
Kirby, thanks for the diagram! That really shows how you do that.
This maybe needs a thread of its own, but here's another wrinkle on locating distant game. I use a compass a lot. One time when a partner wounded a big 4x4 mule deer across a narrow, deep canyon, the buck made it over the far ridge. It was nearly 1000 feet down and back up again, in a burn that looked the same on the whole canyon side, with a mile long ridge above it with no timber or distinguishing marks. Just low even scrub brush, no saddles, bluffs, or humps on the ridge.
I took a compass reading on where the buck crossed the far ridge without taking my eyes off of the spot or moving. If we went straight to it following the compass line, it was going to be a LONG miserable climb down and up. I am lazy about such climbs. Hmmm... Keeping my eyes on the spot where the buck crossed the ridge, by moving 30 feet to one side I could line up the only thing I was sure I could see and identify from the other ridge, a single standing burned snag. So now the compass heading, set on the base plate, went from me straight through the snag to where the buck crossed the ridge.
With that info, we could pocket the compass and easily go around the level contour of the mountain. Once out on the ridge we took a reverse compass reading on the snag, 180 degrees from the reading where we started. I didn't even arithmetic out a reverse heading, just turned the compass around so the south needle read north on the dial, and stopped when it lined up on the snag. Bingo. We were six feet from the buck's tracks and blood trail.
If a wounded animal crosses any line, such as a trail, edge of woods, road, fence, etc. you can use a compass to pick up his trail at that point. Take a compass bearing on the spot where he crossed the line, then mark the spot where you're standing if needed with a cap, etc. (I've used Safeway white plastic shopping bags) so you can see back to it when you get there. Then pocket the compass, walk the easiest way to the line, and go along it till you line up your reverse heading on the spot you marked. Where the compass line crosses the physical linnear feature on the ground, be it fence, edge of clearcut, whatever, that's the spot where you saw the animal. Good way to pick up a trail or a downed animal across a lake, swamp, etc.
Liquid filled compasses with a base plate, about $10, do fine for this kind of work and the needle is steady without the jiggle.