Guns |
|
Metric |
British |
75-mm |
3-inch |
88-mm |
3.4-inch |
105-mm |
4.1-inch |
150-mm |
5.9-inch |
21-cm |
8.2-inch |
28-cm |
11-inch |
30.5-cm |
12-inch |
38-cm |
15-inch |
Torpedoes |
|
Metric |
British |
45-cm |
17.7-inch |
45.7-cm |
18-inch |
50-cm |
19.7-inch |
53.3-cm |
21-inch |
Distances
All distances in this book are given in nautical miles giving the old Admiralty mile as the reference for the nautical mile. This is one minute of arc subtended along a great circle. It is some 4 feet or 1.248 meters longer than the current nautical mile.
1 nautical mile = 1,853.2 meters = 6,080 feet
1 knot = 1 nautical mile per hour
Compass
360 degrees in a circle
32 points in a circle
1 point = 11¼ degrees
8 points = 90 degrees
16 points = 180 degrees (reversal of course)