Strictly a two man operation.
One was wise to always carry a paper chart in case the Decca Scroll Map decided to come apart at the sticky tape joints.
Then it was all hands on deck....in a Single Pilot Helicopter...either a Wessex or S=58T flying offshore in the UK.
Keeping a hand written notebook of the Decca Coordinates of the various Rigs and Platforms was also a good practice.
You could fly one Arc using a Decometer and wait for the intersecting Arc of a different Decometer.
It actually worked quite well once you accepted you were using a rough equivalent of two DME Arcs with some rather different displays than that of a DME.