APPENDICES 



APPENDIX I 



CONVERSION TABLES 



(a) Fathoms and Metres. 

 ONE fathom = 1-828 metres. Approximate equivalents are 



(b) Marine Distances. 



One sea-mile is 6,080 feet, or 1-852 kilometres. 



A cable's length is 8 shackles, or 100 fathoms (strictly 

 2027 yards). 



A knot is a unit of speed, and is a speed of 6,080 feet per 

 hour. It is incorrect to speak of " knots per hour." 



On the assumption that the earth is a sphere, the length of 

 an arc of a meridian subtending an angle of one minute at the 

 centre is 6,077 ^ eet 5 tne nearest whole number to this, 6,080 

 feet, has been taken as the length of the mean' nautical mile. 



