aardwolfe,<br><br>OK I am sort of getting this. <br><br>tan Angle = length/height at local noon, so <br><br>ATan ( length/height) = angle of sun or approximate latitude.<br><br>Presumably, you can determine longitude with more accuracy (time at local noon) then radio SAR and ask them to fly the longitude and apply necessary corrections for time of year variance for latitude.<br><br>If anyone is interested SAR of British Columbia has Pocket Cards (page 4) that shows how to determine the height of an object given the angle from a clinometer equipped.orgpass. Presumably you can shoot the sun with your compass at local noon and get your approximate latitude. Measuring the stick is easier as you can mark and find local noon more precisely without burning out your eyeballs.