The Mark 18 was used in many WWII Navy turrets. The Martin 250CE upper turret with a MK18 was pretty easy to spot. The Martin 250Ce's had either a low or high profile turret dome. The Mk 18's were typically the ones with the high profile dome. This higher profile enabled a flat optical panel for the Mk 18 to eliminate any distortion or parallax issues that were more critical for the computing sight. The sight was taller in the yoke and needed the extra clearance.
Our PV-2 certainly had one as did the Martin 250's in the later PB4Y-2's. I think the Erco tear drops in the Privateer also carried them as did the nose and tail turrets but don't quote me so far from my tech manuals.
I have a hard time picturing gyro sights in Navy fighters in WWII but there must have been some. Just can't bring one to mind.
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