The lights are on
In the ranger compound, after the saving of Reily and her men, find Reily. Ask her how's it going and then she'll tell you she wishes she could go back to mapping. If you say you can help being payed mercenary wage she will say yes and then she says for you to go explore and come back with locations so you can upload them. i had found 164 locations ( obviously she already has some) and I got 4950 caps. You may also return after finding areas to receive a decent amount of caps.