Low Tech
My setup was a small black-and-white monitor, hooked up somehow to a computer somewhere. It only did words, not graphics. It had a grid printed on a clear plastic sheet, taped to the screen. You used normal keyboard commands to move to a "square" and entered a number or a letter in that square, or left it blank if the targeted thing wasn't on the map there. I don't remember any more how I found the right squares on the paper maps. Then on to the next square on the screen until you filled the screen.
Check it over, hit enter, go to next parcel of land. Repeat for hours.
And it was far from the most tedious job I've held.