TruTrak Sorcerer - Manual (Page 10)

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If only NMEA (RS-232) GPS information is available, the autopilot
will overfly each waypoint prior to turning and intercepting the course
line to the next waypoint.
With ARINC steering commands, the autopilot will follow lateral
steering or bank commands generated by a navigation system (EFIS or
GPS). This means the autopilot will round corners and not overfly the
course line to the next waypoint. The display will indicate when the
autopilot is in one of these modes by displaying GPSS in the bottom left
of the display.
The vertical GPS Steering mode (GPSV) is also engaged with GPSS
if the signal is present. If the autopilot is engaged during a climb or
descent, you must either zero the vertical speed with the rocker switch or
press the ALT to engage GPSV. The vertical steering can be decoupled
by selecting any other vertical mode. To re-engage the vertical steering,
press GPSS again, then press ALT or set the SVS to 0 using the rocker
switch.
NOTE: If there is not a steering signal present the GPSS button
will not function.
NAV/LOC Course Mode
Pressing the NAV button will bring up the NAV COURSE (VOR) or
LOC COURSE (ILS) setup screen depending on which is selected by the
navigation receiver. The setup screen for this mode is shown below.
Use the knob to adjust the selected NAV COURSE to the proper
value. Once set, press enter to advance to the intercept angle. This value
is adjustable from 15° to 45°. Rotating the knob will give 5° increments.
Press and hold the knob while rotating to get 1° increments. When the
desired intercept angle is set, press the knob to enter this mode.
The selected intercept angle is converted to an intercept direction
according to which side of the course the aircraft is flying.
In addition, intercept direction is underlined which means it can be
adjusted. With this feature the current direction can be adjusted (for