TruTrak Sorcerer - Manual (Page 11)

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example if being vectored) until the selected inbound course is crossed.
During the intercept phase of the approach, the lower left display will
alternate between
INT and NAV or LOC depending on which mode has
been selected by the navigation receiver. When the aircraft is established
on the inbound portion of the approach, the lower left display will
indicate the selected course.
If the above is LOC COURSE and glide slope is present (ILS), flying
below the glide slope in ALT HOLD mode for a minimum of seven
seconds will arm the glide slope coupler. When this occurs, the display
will show:
When the Glide slope is intercepted, the display will show:
Glide slope coupling can be terminated by entering either the ALT
HOLD or SVS (selected vertical speed) mode. The lateral mode will
switch from LOC COURSE to TRK mode. The selected track will be the
same as the inbound course.
NOTE: When coupled to the glide slope, one push of the VS rocker in
either direction will command a 500 fpm climb and enter TRK mode.
REV Course Mode
Click the REV button to enter the REVERSE COURSE setup screen.
This refers to flying the localizer or VOR in the reverse direction.
Operation of this mode is the same as NAV COURSE or LOC COURSE
except that there will be no glide slope coupling.
Gyro Back-Up Mode
The lateral modes previously described are based on GPS track being
present. When GPS is lost, the autopilot uses its internal gyros for bank
control and
TRK is replaced with BANK . This mode is only a backup and
would seldom be needed; however, it does provide a means of selecting a
desired bank angle, and a means of adjustment if the aircraft turns when