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|  MIL-N-814972A(AS)
Digital True Heading - Digital true heading output
3.4. 2.2
error shall not exceed 0.2 degrees initial error, plus 0.02 degrees per hour
maximum long term drift error.
True Heading (Synchro) -
3.4.2.3
Inertial Mode - The true heading static
(1)
output accuracy shall not deviate from the
digital true heading output by more than
14 arc MIN. Dynamic accuracy of the true
heading synchro output shall-not exceed
17 arc MIN from the value of the digital
true heading output.
Slave Mode - The true heading synchro
(2)
output shall not exceed the accuracy of
the magnetic heading output signal by
more than 10 arc MIN with magnetic
variation set to its proper value.
Stabilized Magnetic Heading (Synchro) - The magnetic
3.4.2.4
heading output signal error excluding flux valve errors, but after
deviation compensation, shall not exceed 30 arc MIN for static con-
ditions.
Grid Heading (Synchro) - The drift error rate of
3.4.2.5
the grid heading output shall not exceed 0.1 DEG/hour maximum with
the Backup Latitude control on the Control, Navigation set to the
local latitude.
Magnetic Variation (Synchro) - The magnetic variation
3.4.2.6
output signal error shall not exceed 42 arc MIN (static condition).
Clutched Heading (Synchro) - The clutched heading
3.4.2.7
output signal error for steady state conditions shall not exceed the
digital true heading output by more than 30 arc MIN. Synchro
return centering error and clutch engagement errors each shall not
exceed 3 arc MIN.
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