|Title||50 Div: The Artillery Story, 1943 - 1944|
|Description||This is a description of the planning, training, problems, and methods evolved prior to the invasion of NORMANDY.|
14. C. Control of Fire
The fire of each troop was controlled by the GPO from the bridge of the LCT. The fire of the Regiment was co-ordinated by the GPO in the control LCT, the centre of the leading line.
15. D. Line and Range
(i) Line. On loading, guns were aligned fore and aft in tho LCT. Once aligned the guns were not traversed and line was applied by swinging the ships heed port or starboard. Line therefore became a naval responsibility.
16 (ii) Range. The range at which the guns were to open fire was decided before sailing. The problem then became firstly to decide when the guns (ie the LCT) were at this range. Secondly, once fire had been opened the range had to be dropped at a rate dependent on the speed of the ship in order to keep the guns "on target".
17. In early experiments cross bearings plotted on to large scale charts proved to be too inaccurate, and it was not until the introduction of Radar that a satisfactory answer was found. The radar set was mounted in a naval ML which sailed in a central position about 200 yards ahead of the regiment in LCT Ranges to the target were obtained continuously, and at a pre-determined range about 2000 to 3000 yards plus of the range at which fire was to be opened, the RA officer in the ML ordered GPOs to start their "COVENTRY CLOCKS".
18. "COVENTRY CLOCKS" solved the second part of the problem. The dial of these clocks is graduated in ranges, and the arm can be set to any required range. The speed of the mechanism can be regulated so that the range alter- action, once the clock is started, in in accordance with
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