Thiis is probably 'off the wall' but take a look at the TDC of the USS Nautilus SSN-571 (Timmyg00s photo - vacation trip)
Just a theory but consider that in the high stress pre-torp launch calculation phase the TDC operator must interreact with
sonar and 'steerage.' Grey areas of baffle coverage must be 'no no' so for operational speed and efficiency sonar
will probably be set to predetermined limits.
So could the diagonal markers shown on the main pointer in the photo have some greater
significance than emphasising direction ?
The indicated angles (and arcs) bear more than a passing relationship to sonar baffles.
egs. Prow baffle 30 deg. SA(?) 125 deg. Rear 60 deg.
Could this be more than coincidence and be of real significance ?
http://www.subsim.com/phpBB/viewtopic.php?t=44465
Possibly just idle musing.............but ? :hmm: