"Ed Rasimus" wrote
"Mortimer Schnerd, RN" wrote:

Four wide angle beams. Two quadrants broadcast A and two broadcast
N--one is dot/dash, the other is dash/dot (don't remember which is A
and which is N.)

When the beams overlapped, defining the published course you got a
steady tone. Veer to one side you began to discriminate A, veer off
course the other way and you got N. One course---hummmmmmmmmm.

Trivial Pursuit: N = dah dit A = dit dah