shaman wrote:I'm going to throw an idea at you. It works. I've tried it. However, I cannot say this idea is going to work in every circumstance, and it may be too much math for most hunters, but it has worked for me.
Let's say you have a bunch of turkeys roosting in the same spot every night, but you don't know where it is. Get out your topo or Google Maps and your GPS and a lensatic compass. When the turkey gobbles, take the compass and shoot an azimuth of where you hear the gobbling. Next shoot the azimuth of another place close by, preferably somewhere on the other side of the turkey. Set a waypoint on your gps where you currently are and walk to the other place. When you get there, set a waypoint, and shoot another azimuth at the turkey.
Now the solution of where the turkey is should be a simple high-school geometry problem. You've got two angles and a baseline and the distance of the baseline. Triangulate. There will only be one solution, and depending on how long your baseline is, you may find yourself within feet of the roosting tree. I've tried it with a 100 yard baseline and been able to take my Garmin Etrex and tell it to put a waypoint so far away at such-and-such bearing, and VIOLA! (Who invited her?)
Where this has come in hand has been where there has been a question as to whether the roost is on my property and therefore worth pursuing, or well off the property and not worth pursuing. By walking a hundred yards from the back of the house and spending about 5 minutes doing my cypherin' I can say for sure whether that gobbler's on my place.
Another place I've used this is down in Southern KY, where there may be 500-800 feet of elevation between you and the gobbler you're hearing. If I do my cypherin' and figure out that birds calling from across a half-mile gorge, I'm probably not going to go after him.
I have done this, but in a little different way.
I have marked 2 different waypoints on a roosted gobbler and got the compass direction from those points. The wider the angle you can get the more accurate you will be BTW. I have a mapping sysytem on my computer that shows lat/Lon coordinates and could mark the coordinates from the 2 waypoints on the map. Then I drew a line at the coresponding compass direction from each waypoint. Where those lines intersect is where the gobbler is roosted. In real world application I have been accurate from 20 to 60 yards.
Another way to do this is with a GPS that can "project" a waypoint. From where you are standing you get a compass direction and a range of how far the gobbler is (you can use a laser range finder if you are so inclined). Then you enter that into the GPS and it comes up with a new waypoint at the point you just estimated. Still doing 2 different angles on the roosted bird is better if possible.
This is practical for me in mountainous country when you are hearing a roosted bird go off across a valley on another hillside. Makes it a lot easier to get into a good position the next morning.