From a common sense point of view, the movie doesn't make much sense to me.
1. Secondary compass is a standard device for a pilot since forever.
2. Electrical failure doesn't equate to conpass failure. Especially in the pre-digital era, the compas and altimeter would still work with the engine off and now power. Same with speed meter. They were purely mechanical devices based on earth's magnetic field, pitot tube (dynamic/static pressures), air density/pressure/temperature. Fuel gauge also used to by purely mechanical back then, and that one seemed to work till the very end.
3. The behaviour of the pilot doesn't make any sense whatsoever. It's like he never went through any common sense training. If you have any sort of issues with the plane's controls early in your trip, you don't push forward for your destination, you get back and land.
4. If you have compass and altimeter failure and see a cloud front, you avoid it at all costs.
5. Basic training also covers (to this day) star and sun nativation. Yes, if you know the time and date, you can easily determine with good precision the cardinal points and navigate to land. It doesn't make any sense that he starts doing "triangle formation" over the see when he still had plenty of fuel. You find land at all costs and try to find an empty field or road or something. Given the full moon he had during that night, it should have been really easy. It absolutely doesn't make any sense to ditch over water with land km away.
6. Also, the way he tried to "save fuel" didn't make much sense to me either. If you want to maximise endurance, you basically have to fly at minimum power which still keeps you in the air while gliding the plane. Each plane has a different maximum endurance envelope/settings and it's a combination of engine settings, flight controls settings, altitude and speed - no "triangle formation" required.
7. Overall - absolute rubbish. The entire movie doesn't hold water from a technical point of view. The existence of ghosts is more believable to me than that pilots' behaviour.
