| Conning Tower |
Raised platform on the top of a submarine located in the centre of the craft. |
| CC-ORS/ O.R.S. |
Costal Command Operational Research Section |
| Depth Charge (D.C.) |
An explosive device dropped into water which is set to detonate at a certain depth or after a certain time. |
| Lethal Radius |
If a U-boat's hull lies closer to the centre of an explosion than this distance it will be destroyed. |
| Line Error |
When the line of a stick is to the left or right of the target. |
| O.R. |
Operational Research |
| Range Error |
When the centre of a stick is infront of or behind the target. |
| Stick |
A series of bombs or depth charges dropped in a line. |
| Stick-spacing |
The nominal distance between consecutive bombs or depth charges dropped in a stick. |
| U-boat |
German submarine. |
