With a loran and handheld GPS onboard, who needs something as old fashioned as the "whiskey compass"? Why, you do, of course, amigo. Sorry to downplay the awesome accuracy of your new miracle nav-aids but our omnipotent FAA, in effect, mandates through its FAR Regardless of any other fancy directional equipment you may have. This means in level flight your compass deviation error must not be greater than 10 degrees on any heading. I guess even the FAA concedes that holding a compass heading within 10 degrees in rough air is a challenging enough accomplishment for most pilots. Anyway, your compass is a mandatory and useful instrument.
Swinging The Compass
Aircraft Compass System Alignment Formulae | Duncan Aviation
Compass Swing Requirements
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The steps to perform a compass swing are reviewed, as a new product designed to save time and headaches when performing the task is examined. Compass swing — those two words bring images of a time-consuming task. In this article, we will discuss performing a compass swing as well as take a look at a new product designed to save time and headaches when performing this task. Whenever the accuracy of the compass is suspected After a cockpit modification or major replacement involving ferrous metal Whenever a compass has been subjected to a shock; for example, after a hard landing or turbulence After aircraft has passed through a severe electrical storm After a lightning strike Whenever a change is made to the electrical system Whenever a change of cargo is likely to affect the compass After an aircraft has been parked on one heading for more than a year When flux valves are replaced.