![]() It’s worth remembering however, that the declination of specific locations change over time, so be sure to check the map’s revision date. Most maps include the zonal declination in the legend at the bottom. Because a single degree of error can set you off course by 100 feet over a mile, it’s important to accurately adjust for declination.īefore you can adjust for declination, you must find the declination value in your trip area. however, declinations vary from 20 degrees east in parts of Washington state to 20 degrees west in parts of Maine. For example, the UK’s magnetic variations are small (only a few degrees) and can often be ignored. This is due to the influence of the planet’s fluctuating magnetic fields.ĭeclination varies around the world. Depending on your location, your compass’s magnetic north could be off of the true north by several degrees. The magnetic north your compass points to is different to the Earth’s true north. This difference is known as “declination”. Next you need to allow for the difference between magnetic north and true north. The map is now oriented towards ‘magnetic north’. Holding the map and compass steady, rotate both the map and the compass until the magnetic needle (highlighted north) is in line with the bezel and compass rose on the dial. If they aren’t, rotate the stainless steel bezel until they do so. Note: ensure that the bezel and compass rose on the dial are lined up with the index line. Rotate the compass case until the orientation lines are aligned with the grid lines of the map. ![]() Place the compass flat on your starting position on the map ( X). To start, you need to know where you are on the map: this is denoted “ X ”. You can now continue your walk following the same bearing. Rotate your body until the magnetic needle pointer aligns with the North indicator on the compass face and bezel (keeping your compass face and bezel in the same position). If you’re worried that you’re going off track, open your compass and place the compass flat on your palm. Following the same bearing from two different places will not get you to the same destination. Note: Bearings are always relative to a specific location. As long as the North indicator on the stainless steel bezel is aligned with the magnetic needle pointer (highlighted North) your bearing is accurate. You can begin your walk by following this bearing. The direction of travel is now in line with your bearing. You can now read your bearing from the index line: i.e. ![]() This will influence the magnetic needle and give a false reading. Note: Do not take compass readings directly under power lines, or near anything metal (e.g. Holding the compass flat and steady, rotate the stainless steel bezel until the North indicator on the bezel and cardinal points on the compass rose are aligned with the magnetic needle pointer (highlighted North). It could be a distinctive tree, rock, hill peak, or similar. Choose a distinctive landmark in the distance that's in exactly the right direction. Open your compass and place it flat and level on your palm.Īlign compass ‘top shell sighter’ with a chosen landmark.
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