The larger the compass card the easier it is to read, especially on a long night watch, and therefore the more accurate the course steered. Aboard ships an eight inch card would be normal, with six inch cards for wing compasses. For our type of boat a four inch card is an acceptable compromise.

We offer our exceptionally good value Seamaster compasses with four options: the card can be flat or conical and the choice will largely be dictated by where the compass can be sited. If the helm can look down on the compass then a flat card can be chosen, as these are designed to be read across the top to the far lubberline, with the advantage that the dome acts as a lens, magnifying the scale and lubber line.

Novice helmsmen usually find it easier with a leading line that moves around the card in the same direction as the bow.

If though the compass has to be mounted nearer the helm's line of sight and some people prefer this head up position, and many motor boat consoles determine it, then an edge reading conical card will be necessary.

The other choices are either a 360 degree gimballed card and lubberline, or a 60 degree tilting card. Obviously a titling card is a much less expensive option than a fully gimballed system. Most sailing boats will need a fully gimballed card as, if beating to windward, you are already heeled 20 degree a further 10 degree in a gust will lock up a tilting card. On the other hand in a motor boat, that seldom rolls more than 15 degree either way, there is no point in the extra expense of a fully gimballed card. These compasses are suitable for high speed motor boats with shock absorbing to aeronautical standards.

The capsules are liquid filled to ensure smooth and fast damping and then hermetically sealed. The expansion diaphragm is designed to operate between -40 degrees(F) to 140 degrees (f). These cards are fitted with two Alnico - 5 magnets. Compensation is built in. Mounting is straight forward with four bolting down lugs as shown.

An easily detatched hood protects from sun glare when needed and is fitted with a red light for night sailing.