I am building an internal GIS for a relatively small land company (around 50,000 Acres +/-) from the ground up. I have access to old maps that display meets and bounds. I have been using COGO to draw my parcels, but since most of the surveys were done in the late 1800s to early 1900s, I have no referenced point to start from ( most call for tree stumps or wooden stakes). Some of the maps have the magnetic declination on them and others dont. for the ones that show the declination, would I just plug the traverse into COGO and go or do I need to do something to account the the difference in declination? What should I do and how should I do it?
