So, I've recently learned about the Schiehallion experiment, performed in 1774, where scientists detected the deviation from the vertical of a plumb due to the gravitational attraction of a single mountain in Scotland. To choose the place, they surveyed for a large mountain as isolated as possible from any large masses and close enough for the expedition to make it cost effective.
I was wondering if there are any modern world maps of observed or predicted vertical deviations of a plumb. I guess they can be computed from elevation maps + rock density maps, but I'm unable to find one. There are many maps showing the gravitational anomalies but they only show how the gravitational acceleration changes and not the angle of the deviation in each place.
I would like to know what is the largest deviation possible on the surface of Earth (on land), and in particular what is the largest in Europe.
I guess that the shores of volcano islands like Tenerife might be good candidates since you have a huge mountain in one direction and almost nothing in the other. Also I guess the north of India where there are plains close to the Himalayas are also good places to think about.