Q. Can one dowse from a hand drawn map?
A. This is my 29th year of professional Map Dowsing. I agree with my late Mentor, Verne L. Cameron, who successfully performed Map Dowsing assignments for 44 years, before I became active with the remote locating work.
"If one is careful, one can accurately Dowse a hand-drawn map, as well as any commercially printed chart." One must be very careful in any attempt to pin-point and exact site at a distance. The possibility of error proportionately increases, when any lines, drawings, configurations and relationships are not drawn to scale. Otherwise, the principles of Dowsing remain the same; whether one is Dowsing a sketch, hand-drawn map or even a transparent overlay.
Hope this helps.