GRUMMAN S2F ARN-30 COURSE DEVIATION INDICATOR

The ID-453/ARN-30 Course Deviation Indicator was located to the bottom right of the pilot's artificial horizon just in front of the control column. 

Comprising 2 pointers and 2 ‘Flags’, the Course Indicator enabled the pilot to follow an FM homing transmission to or from its base of origin.

The large Course Selector Knob at the bottom right of the unit rotated the ‘paired’ Course Pointers around the outside dial representing the 360 degrees of the compass. From here the pilot would initially set the course heading.

The ‘floating’ Horizontal and Vertical pointers adjusted up, down and left or right of the central target circle. The Horizontal Pointer indicated the strength of the FM signal being received, deflecting downwards as signal strength decreased.

The Vertical (reciprocal) Pointer centred itself when the Caribou was either flying directly to or away from the transmitting station. Deflection of the pointer indicated the direction of turn (right or left) to stay on course.

The ‘OFF’ Vertical and ‘OFF’ Horizontal Flags disappeared when the FM Homing circuits were functioning properly.

Manufactured by the Aircraft Radio Corp, this original and battle hardened Course Deviation Indicator carries service stamps on its rear casing and the Course Selector Knob is fully functioning.

Mounted in its 100 yr old mango wood display stand with engraved plaque and detailed laminated colour Fact Sheet, this original Grumman S2F Tracker Course Deviation Indicator also come with a custom-built highly detailed 1/72 or larger 1/48 model of this iconic maritime anti-submarine patrol aircraft.

* Note that this S2F Grumman Tracker Instrument is pictured with a 1/48 scale model rather than the standard detailed, but smaller 1/72 scale. Click on the 'Model Upgrade' option at the top of this page for the larger, super detailed 1/48 scale.

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