Navigational terms

Here are some important navigational terms. You should know these in order to understand navigational data and minimise the risk of missunderstandings.
Degrees True (T) stands for direction or bearing that is relative to true north. For example 090° T(True).
Degrees magnetic (M) stands for direction or bearing that is relative to magnetic north. For example 260° M(Magnetic). No correction for variation has been applied.
Degrees compass (C) stands for direction or bearing that is meassured by the compass. For example 123° C(Compass). No correction for variation and deviation has been applied.
Variation stands for the angular difference between Magnetic North and True North.
Deviation stands for the difference between a compass reading and a magnetic reading, caused by the magnetic fields on the boat.
Knot stands for the unit of speed used at sea. 1 Knot is 1 Nautical Mile per hour. You can either say that the boat´s speed is 1 Knot or 1 Nautical Mile per hour.
Nautical Mile stands for the unit of distance at sea. It is based on the cirumference of our planet.
1 Nautical Mile is 1852 meters/6076 feet, or 1 minute of latitude. 1 Nautical Mile is divided into 10 cables. 1 cable is 185 meters/200 yards.
Dircetions at sea, for example a landmark, are expressed in degrees. They are measured clockwise and are relative to True North.