go with the 1:24,00.00. if you are using a gps, and have it set to utm, the utm grids are all ready printed on the sides of the map. if you have never used a map, NORTH is always at the top. there is a ton of information contained on the maps, different colors mean different things, there are websites available to help you with this. contour lines on a map are normally in brown, the closer the lines, the steeper the terrain, blue is water, green vegetation, black is manmade objects, etc etc. always carry a compass with you along with your gps, learn to use the compass. hope this helps a litte.