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I got this on a diversion from Nogales and was confused until I realized there was no reverse sensing on my HSI. I hadn't flown a BC in about 25 years :-). There are none in the northeast US where I do most of my flying.
Front course inbound in the OBS?
Yep, I figured it out in a hurry as the diversion was because of ice. Last time I'd flown a LOC BC was in training with raw data (and reverse sensing). Somewhere in the deep recesses of memory was "with HSI always set inbound course", but in a stressful situation while also searching for the correct plate, it took a minute for brain to process. Stress compounded by the fact that Garmin didn't have this plate in their database. As I was about to confess to the controller that I didn't know the MDA, we broke out.