typedef struct {
  long lAltitudeSourceInput;
  SIRF_DEGRADED_MODES dmDegradedMode;
  SIRF_DOP_MASK_MODES dmDOPMaskMode;
  SIRF_DGPS_SOURCES dsDGPSSource;
  SIRF_DGPS_MODES dmDGPSMode;
  unsigned char ucAltitudeConstraint;
  unsigned char ucAltHoldMode;
  unsigned char ucAltHoldSource;
  unsigned char ucDegradedTimeout;
  GPSBOOL fTrackSmoothMode;
  GPSBOOL fStaticNavMode;
  GPSBOOL fThreeSVLeastSquares;
  double dNavElevationMask;
  long lNavPowerMask;
  GPSBOOL fLPPushToFix;
  unsigned short usEditingResidual;
  unsigned char ucDGPSTimeout;
  unsigned char ucDRTimeout;
  unsigned long ulLPOnTime;
  unsigned long ulLPInterval;
  unsigned long ulLPUserTaskInterval;
  unsigned long ulLPMaxSearchTime;
  unsigned long ulLPMaxOffTime;
  double dSteadyStateDetection;
  double dStaticNavigation;
  GPSBOOL fLPUserTasksEnabled;
  GPSBOOL fLPPowerCyclingEnabled;
} SIRF_NAVMODE_GET_PARAMS;
typedef struct {
  GPSBOOL fThreeDMode;
  GPSBOOL fAltConstraint;
  GPSDEGRADED_MODES dmDegradedMode;
  GPSBOOL fDRMode;
  GPSALTITUDE_HOLD_MODES ahmAltHoldMode;
  GPSALTITUDE_HOLD_SOURCES ahsAltSource;
  GPSBOOL fTrackSmoothing;
  short lAltitude;
  unsigned char ucCoastTimeout;
  unsigned char ucDegradedTimeout;
  unsigned char ucDRTimeout;
} SIRF_NAVMODE_SET_PARAMS;