SPEED LOGS

Types of Speed Using in Navigation;

Speed (S) is rate of motion, or distance per unit of time. Aknot (kn.), the unit of speed commonly used in navigation, is a rate of 1 nautical mile per hour. The expression speed of advance (SOA) is used to indicate the speed to be made along the intended track. Speed over the ground (SOG) is the actual

speed of the vessel over the surface of the earth at any given time. To calculate speed made good (SMG) be-tween two positions, positions by the time elapsed between the two positions.

We have no speed log on board, we could just learn the speed that we made from the GPS and this the speed accorcing to the land.