XPLMFindFirstNavAidOfType

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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.