Hi Pops, I never saw the notification for your message until today. I don't know anything about dowsing. From what I understand they print a map and do it over the map.
Sorry for the late response.
Ism, I was just at a post for a pic to be dowsed. You were a poster. I have just started in dowsing. I have L Rods and have found water lines. I am going to make a pendulum and was interested in map dowsing. Can you dowse from the computer? or Do you have to print the map? I am going to be dowsing county maps looking for caches. Thanks for any information that can help.