I used the simple Microsoft Paint program on my computer to highlight aspects about the land. I've done this type of work before on a different piece of land, and I've found a couple advantages for doing so. 1) You can test your own knowledge of the land and fence lines. 2) It can become easier to pattern deer movement with a larger view of the land. 3) If two or more people are hunting the same piece of land, you can each have a map and coordinate where you are going to hunt together. You know exactly where they are going to be, and they know exactly where you are going to be. In the past, I have printed and laminated these maps and handed them out before the hunt started. You can also use dry-erase markers on the laminated surface and create a plan of action for your group right on the map. With this map, there is no more fear of firing in the wrong direction.
For my geographic map, I found a handy website that is updated every now and again by Iowa State University. From what I understand, Google Earth will also generate a geographic map for you (and possibly topographic/other helpful maps).