Asdic
Introduction
As the war started, the Royal Netherlands Navy was very ill-equipped concerning anti-submarine warfare. The only submarine detection available ( on the few ships which had submarine detection devices ) was a listening device, a decade old. The only improvement came when the British, on Dutch request, began sending Asdic equipment to the NEI for the ships serving in this region. The first load, on board the British merchant Automedon was intercepted by a German raiders, but later shipments began arriving shortly after. After the fall of the NEI, Dutch ships began to receive Asdic and ( US ) Sonar for their ships, while the ships taken over by from the British and Americans, already had such equipment built in.
Type 123
Standard asdic type for the Flower-class corvettes. Very rudimentary, but reliable. Her biggest shortcoming was the fact that she couldn't pinpoint the submarine's depth. The dome was fixed, because the asdic could take a maximum speed of 18 knots, while the corvette could only do about 16.
| Specs | |
| Classes used on | Flower-class corvettes |
| Year | 1934 |
| Band | 14 to 22 Kilocycles |
| Range | |
| Gyro | Magnetic |
| Dome specs | |
| Type | Fixed |
Type 124
This was an updated version of the Type 121
| Asdic specs | |
| Classes used on | Town-class escorts |
| Year | 1936-1937 |
| Band | |
| Range | |
| Dome specs | |
| Type | Retractable |
Type 128
| Asdic specs | |
| Classes used on | River class frigates |
| Year | 1937 |
| Band | |
| Range | |
| Dome specs | |
| Type | Retractable |
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