XPLMGetFirstNavAid

XPLM_API XPLMNavRef XPLMGetFirstNavAid(void);

This returns the very first navaid in the database. Use this to traverse the entire database. Returns XPLM_NAV_NOT_FOUND if the nav database is empty.

XPLMGetNextNavAid

XPLM_API XPLMNavRef XPLMGetNextNavAid(
                         XPLMNavRef           inNavAidRef);

Given a valid navaid ref, this routine returns the next navaid. It returns XPLM_NAV_NOT_FOUND if the navaid passed in was invalid or if the navaid passed in was the last one in the database. Use this routine to iterate across all like-typed navaids or the entire database.

XPLMFindFirstNavAidOfType

XPLM_API XPLMNavRef XPLMFindFirstNavAidOfType(
                         XPLMNavType          inType);

This routine returns the ref of the first navaid of the given type in the database or XPLM_NAV_NOT_FOUND if there are no navaids of that type in the database. You must pass exactly one navaid type to this routine.

XPLMFindLastNavAidOfType

XPLM_API XPLMNavRef XPLMFindLastNavAidOfType(
                         XPLMNavType          inType);

This routine returns the ref of the last navaid of the given type in the database or XPLM_NAV_NOT_FOUND if there are no navaids of that type in the database. You must pass exactly one navaid type to this routine.

XPLMFindNavAid

XPLM_API XPLMNavRef XPLMFindNavAid(
                         const char *         inNameFragment,    /* Can be NULL */
                         const char *         inIDFragment,    /* Can be NULL */
                         float *              inLat,    /* Can be NULL */
                         float *              inLon,    /* Can be NULL */
                         int *                inFrequency,    /* Can be NULL */
                         XPLMNavType          inType);

This routine provides a number of searching capabilities for the nav database. XPLMFindNavAid will search through every navaid whose type is within inType (multiple types may be added together) and return any navaids found based on the following rules:

• If inLat and inLon are not NULL, the navaid nearest to that lat/lon will be returned, otherwise the last navaid found will be returned.

• If inFrequency is not NULL, then any navaids considered must match this frequency. Note that this will screen out radio beacons that do not have frequency data published (like inner markers) but not fixes and airports.

• If inNameFragment is not NULL, only navaids that contain the fragment in their name will be returned.

• If inIDFragment is not NULL, only navaids that contain the fragment in their IDs will be returned.

This routine provides a simple way to do a number of useful searches: * Find the nearest navaid on this frequency. * Find the nearest airport. * Find the VOR whose ID is “BOS”. * Find the nearest airport whose name contains “Chicago”.

XPLMGetNavAidInfo

XPLM_API void       XPLMGetNavAidInfo(
                         XPLMNavRef           inRef,
                         XPLMNavType *        outType,    /* Can be NULL */
                         float *              outLatitude,    /* Can be NULL */
                         float *              outLongitude,    /* Can be NULL */
                         float *              outHeight,    /* Can be NULL */
                         int *                outFrequency,    /* Can be NULL */
                         float *              outHeading,    /* Can be NULL */
                         char *               outID,    /* Can be NULL */
                         char *               outName,    /* Can be NULL */
                         char *               outReg);    /* Can be NULL */

This routine returns information about a navaid. Any non-null field is filled out with information if it is available.

Frequencies are in the nav.dat convention as described in the X-Plane nav database FAQ: NDB frequencies are exact, all others are multiplied by 100.

The buffer for IDs should be at least 6 chars and the buffer for names should be at least 41 chars, but since these values are likely to go up, I recommend passing at least 32 chars for IDs and 256 chars for names when possible.

The outReg parameter tells if the navaid is within the local “region” of loaded DSFs. (This information may not be particularly useful to plugins.) The parameter is a single byte value 1 for true or 0 for false, not a C string.

XPLMCountFMSEntries

XPLM_API int        XPLMCountFMSEntries(void);

This routine returns the number of entries in the FMS.

XPLMGetDisplayedFMSEntry

XPLM_API int        XPLMGetDisplayedFMSEntry(void);

This routine returns the index of the entry the pilot is viewing.

XPLMGetDestinationFMSEntry

XPLM_API int        XPLMGetDestinationFMSEntry(void);

This routine returns the index of the entry the FMS is flying to.

XPLMSetDisplayedFMSEntry

XPLM_API void       XPLMSetDisplayedFMSEntry(
                         int                  inIndex);

This routine changes which entry the FMS is showing to the index specified.

XPLMSetDestinationFMSEntry

XPLM_API void       XPLMSetDestinationFMSEntry(
                         int                  inIndex);

This routine changes which entry the FMS is flying the aircraft toward. The track is from the n-1'th point to the n'th point.

XPLMGetFMSEntryInfo

XPLM_API void       XPLMGetFMSEntryInfo(
                         int                  inIndex,
                         XPLMNavType *        outType,    /* Can be NULL */
                         char *               outID,    /* Can be NULL */
                         XPLMNavRef *         outRef,    /* Can be NULL */
                         int *                outAltitude,    /* Can be NULL */
                         float *              outLat,    /* Can be NULL */
                         float *              outLon);    /* Can be NULL */

This routine returns information about a given FMS entry. If the entry is an airport or navaid, a reference to a nav entry can be returned allowing you to find additional information (such as a frequency, ILS heading, name, etc.). Note that this reference can be XPLM_NAV_NOT_FOUND until the information has been looked up asynchronously, so after flightplan changes, it might take up to a second for this field to become populated. The other information is available immediately. For a lat/lon entry, the lat/lon is returned by this routine but the navaid cannot be looked up (and the reference will be XPLM_NAV_NOT_FOUND). FMS name entry buffers should be at least 256 chars in length.

WARNING: Due to a bug in X-Plane prior to 11.31, the navaid reference will not be set to XPLM_NAV_NOT_FOUND while no data is available, and instead just remain the value of the variable that you passed the pointer to. Therefore, always initialize the variable to XPLM_NAV_NOT_FOUND before passing the pointer to this function.

XPLMSetFMSEntryInfo

XPLM_API void       XPLMSetFMSEntryInfo(
                         int                  inIndex,
                         XPLMNavRef           inRef,
                         int                  inAltitude);

This routine changes an entry in the FMS to have the destination navaid passed in and the altitude specified. Use this only for airports, fixes, and radio-beacon navaids. Currently of radio beacons, the FMS can only support VORs and NDBs. Use the routines below to clear or fly to a lat/lon.

XPLMSetFMSEntryLatLon

XPLM_API void       XPLMSetFMSEntryLatLon(
                         int                  inIndex,
                         float                inLat,
                         float                inLon,
                         int                  inAltitude);

This routine changes the entry in the FMS to a lat/lon entry with the given coordinates.

XPLMClearFMSEntry

XPLM_API void       XPLMClearFMSEntry(
                         int                  inIndex);

This routine clears the given entry, potentially shortening the flight plan.

XPLMGetGPSDestinationType

XPLM_API XPLMNavType XPLMGetGPSDestinationType(void);

This routine returns the type of the currently selected GPS destination, one of fix, airport, VOR or NDB.

XPLMGetGPSDestination

XPLM_API XPLMNavRef XPLMGetGPSDestination(void);

This routine returns the current GPS destination.