![]() ![]() sim/cockpit2/autopilot/heading_mode will read 13 if GPSS is active. The sim/cockpit/autopilot/autopilot_state flag field now has the flag 2^19=524288 to indicate whether the mode is active, similarly, writing that value toggles the mode. Note that the mode will refuse to engage when no waypoint is active in the GPS/FMS. The new command sim/autopilot/gpss toggles the GPSS mode on or off. This new mode is now available without plugins. Various X-Plane add-on aircraft have achieved similar functionality through various kinds of plugin trickery in the past. ![]() ![]() The autopilot will follow the GPS flightplan until it intercepts the localizer, at which point tracking will switch from GPSS to NAV (VOR or LOC). In this case, GPSS is active, the HSI selector can be turned to a VOR/LOC receiver, and then NAV or APPR mode can be armed. Thus, it allows you to arm localizer interception, while tracking a GPS flightplan that for example takes you through an RNAV transition onto the ILS approach. What is important is that the GPSS mode is treated like a heading mode when it comes to dual-mode intercepts. If a valid GPS steering cue is available (a waypoint is active) it engages immediately. However, it works on a separate channel that is hardwired to the GPS/FMS in the plane including for front course (DTK) information. GPSS tracks the GPS or FMS flightplan, with all the benefits you are used to from GPSS: turn anticipation and automatic tracking of arc segments, holdings and procedure turns. X-Plane 11.10 now supports a separate autopilot nav mode that works only with GPS steering cues: GPSS. The new separate Autopilot NAV mode: GPSS Thus, NAV mode is never engaged directly, but armed (using a command, dataref or 2d panel button). In order to engage, the NAV mode needs either a both falling and less-than-full deflection on an angular offset (VOR, LOC), or an absolute XTK (GPS/FMS). Dual-mode intercepting allows the autopilot to follow a heading, until a selected VOR radial or localizer course is intercepted, at which point the tracker/coupler takes over from the heading mode. Thus, there’s only one NAV mode to take care of tracking the GPS flight plan, or intercepting and tracking a VOR radial or localizer.ĭepending on the source, the nav mode can be armed before it actually engages, which is done for example in dual-mode intercepting. With the HSI source selector, either a VOR/LOC receiver or a GPS/FMS can be selected to feed lateral deviation (what is indicated by a CDI) to the autopilot, whilst the desired track is fed to the autopilot by a number of different sources that can be configured. X-Plane’s autopilot always has and always had one channel for a tracker/coupler function, that works on both low-sensitivity sources like VORs and high-sensitivity like LOCalizers. Autopilot NAV modes: source selector and engagement ![]()
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