Without good navigational skills, your expedition could lead to failure or result in a dangerous situation. Try to use a laminated map which is better in wet conditions. 1:25,000 scale maps provide the greatest detail. One grid square equals 1 kilometer. Use map keys for reference. Don't mistake boundary walls for footpaths. A compass points to magnetic north and the top of the planet is called true north. Magnetic north is constantly moving and its position relative to true north is different in different locations. Use a route card to plot your route on the map. The end of one leg is always the start of the next one. To take a bearing, place your compass edge along the intended route. Read the number from the index line and add the magnetic variation to get your bearing.