This simple to use slide rule from Blundell Harling calculates the third variable given the other two (i.e. distance covered, given speed and elapsed time).
A bright blue directional arrow prevents accidental reciprocal bearings and the edges are graduated for tide and boat speed. Fixed grid base helps plotting lat. and long. from GPS
This pack covers Meteorology in UK waters with particular relevance to the RYA courses. Playing card size flip cards provide a very easy learning platform and are ideal for revision.
The cards show equipment and procedures for HF, VHF and MF, including Digital Selective Calling. Playing card size flip cards provide a very easy learning platform and are ideal for revision.
Each card shows a flag of the International Code in colour on the face, with the signal letter or number and the meaning of the signal flag on the reverse.