Welcome to our quiz this month.
A tricky one if you can't remember how to convert compass to true or true to compass bearings.
The effect of variation is the same for all vessels in the same area at the same time. Deviation is specific to the boat and the course it is steering on. We usually assume that the hand bearing compass has no deviation, this is not strictly true. Most modern wood or fibreglass boats can reduce deviation to a very small amount, which can be ignored for practical purposes, provided that a suitable place has been found for the compass. If you have a steel or Ferro-cement boat, you will probably have a considerable deviation.
One degree is not going to matter in most of what we do on small craft, but it is useful to realise the limitation of this type of calculation. (An error of 1° on a passage of 60M will put the vessel 1M out at the other end of the voyage.)
For the purpose of this quiz you are going to take deviation into account where indicated.
Good Luck
