Typical DEWLine Stations
There were two types of stations, Main and Auxiliary. The sites were placed approximately 100 miles (160 KM) apart, along the 69th parallel about 200 miles inside the Arctic circle.
Originally, there was a third type of station called an Intermediate site (I-Site), located midway between each of the Main and Aux sites, and would have been home for about 5-people. The 28 I-Sites proved ineffective and were abandoned in 1963.