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Compasses are a navigational instrument utilising a magnetized needle giving a frame of reference based on North, South, East and West, as well as their intermediate directions such as SE, NW etc. This is based on Magnetic North, and not True or Grid North.

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Compass compatibility: Can I use my US compass in Australia?

All of the standard compasses sold at New Zealand are balanced for Zone 5. … A typical feature for regular compasses is that they can function without problems only at limited longitudes because the changes in the magnetic field affect the position of the needle. …
Christian Deckert's user avatar