Sec. 25.1547 - Magnetic direction indicator.
(a) A placard meeting the requirements
of this section must be installed on, or near, the magnetic direction
(b) The placard must show the
calibration of the instrument in level flight with the engines operating.
(c) The placard must state whether the
calibration was made with radio receivers on or off.
(d) Each calibration reading must be in
terms of magnetic heading in not more than 45 degree increments.