A friend and I are about to start a project of mapping out a very large complex of buildings. What we're looking for is an app that can display our current location on a Google Earth image, and allow us to mark points on it in similar fashion to how you add placemarks on the computer version of Earth.

Maybe I'm just stupid, but I can't find any kind of placemark function on my Google Earth app.

I know such a thing must exist but I don't know how to go about finding it in the play store. Can anyone point me in the right direction?