On the maps I have on hand show the grids are 5,000' X 5,000' which makes it easier to figure out the distance on larger areas. The maps have a legend explaining what the icons mean. The larger maps will tell longitude and latitude for the grids which helps when using a GPS enabled with this feature to pinpoint your location within a few yards. I agree with Johnch that a compass is invaluable when needed. Always have one in your pack and get familiar with using it. Don't trust the sun (the old rises in the east, sets in the west thing). During the winter as you know the days are quite a bit shorter than during summer. This is because the sun takes a more eliptical path in winter. Doesn't set due west.