blocks or counters were then moved [at regular
intervals] to both identify the relative positions
of both 'friend' and 'foe' but also to track the
movements of squadrons and individual aeroplanes
as the attack unfolded.
Navy also adopted this tool and one was installed
in the control room of HMS Ark Royal when she
was in dry dock in Liverpool.
role of the plotters was a critical one, the work
was demanding and instructions to the pilots and
information from the radar traces had to be rapidly
and accurately interpreted by the ground controllers
who generally were positioned around and above
the plotting table; 'theatre-style'.