Calculate point location from offset observer

Discussion created by dgordon13 on Jun 8, 2011
Latest reply on Sep 2, 2015 by shahafridi
I'm conducting a forest bird survey in which I need to precisely record locations of individual birds. It's impossible to use a GPS to directly find the coordinates for each sighting because of the steep terrain and forest canopy. But I do have UTM coordinates for many control points across my study site. From these controls, I can get an azimuth and distance to observed birds using a compass and range finder. So, is there a tool, program, or calculation I can use to find the UTM coordinate of a bird from the coordinate of the observer, plus distance and azimuth estimates?  It would be perfect if I could do this as a calculated field in my attribute table.  Any help would be very much appreciated!

I'm working with ArcGis 9.3.