
Every essential calculation you need for coastal & offshore navigation This book is an aide memoire bringing together in an easy to understand guide all the frequently needed but often forgotten equations & formulae needed by sailors. The format will be the same throughout: the equation followed by a worked example to show how it should be done. Illustrations will be line drawing to help the reader understand what they are doing & why they are doing it. Calculations included are:* Distance to the visual horizon & the radar horizon* Distance off by vertical sextant angle, horizontal sextant angle, bearings & eho ranging* Calculating course made good, course to steer, set & drift of current & speed & direction of true wind* Sailing to weather & Storm avoidance* Calculating speed through water for estimate time on passage, distance sailed, maximum hull speed for a displacement vessel & spacing of knots on log line* Calculating amplitudes & azimuths of sun & stars.* Calculating wave height, wave length, wave period* Measuring degrees converting degrees, minute & seconds to degrees & decimals of degree* Measuring length Converting imperial units to metric & metric to imperial* Measuring mass Converting imperial units to metric & metric to imperial* Measuring speed Converting imperial units to metric & metric to imperial* Measuring Volume Converting imperial units to metric & metric to imperial. This would also include US measures.