| Country of origin | Canada |
|---|---|
| Introduced | 1940 |
| No. built | 3 |
| Type | Coast watching |
| Frequency | VHF |
| Pulsewidth | 0.5 μs[1] |
| Range | 10,000 yd (9.1 km)[1] |
| Power | 1 kW[1] |
| Other Names | NW |
Night Watchman (NW) was an early Canadian radar system used during World War II. It was installed in a fixed emplacement on the approaches to Halifax Harbour in Nova Scotia in July 1940, used to watch for ships or submarines attempting to enter the harbour area. It was the first radar of Canadian design, and the first radar of any sort to be used operationally in North America. A second unit was built for use in the United States, and a third as a backup for the first in Halifax.