HOW TO CHOOSE THE RIGHT COMPASS
How To Choose The Right Compass
True or geographical north is referring to the actual North Pole and doesn’t really matter much for navigation.
Grid north is referring to the top of your map. This doesn’t refer to a certain point on your map, grid north is the entire top line of your map.
Magnetic north refers to the earth’s magnetic field.
The declination on your compass is the difference between true and magnetic north, and it can vary or change depending on where you’re located, which is why an adjustable declination is important. Being able to adjust the declination on your compass means that you can use the same one in a variety of regions without having to worry if it’s accurate or not.
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Another thing to be aware of are accessory compasses. Accessory compasses can be found on zipper pulls, key chains, or watches and are usually nothing more than fashion accessories. They’re fun to look at and play with, but not accurate enough for actual use.