Compass, Magnetic Direct Reading, US Navy Mark IX Carvair The US Navy's TBM Avenger

The US Navy's TBM Avenger Torpedo Bomber also used this venturi

While the B-6 may have been used in some versions of dual engine aircraft such as fighters P-38 or P-61

It is the basic reference book for aircraft navigators in the performance of their duties

one in the driver’s hatch that rotated

Compass, Magnetic Direct Reading, US Navy Mark IX Carvair The US Navy's TBM AvengerHere is an example of the WWII era US Navy Aircraft Direct Reading Magnetic Compass Mark IX, as used in the seaplanes PBY Catalina and PBM Mariner Patrol Bombers. The compass was illuminated electrically via bulb mounted in a small compartment over the compass itself. Inside the same compartment is access to the direction compensating screws, used to calibrate the compass. This example is in reasonable condition for its age. The fluid is absent.