Change NMEA mode setting, thus major changes in gpsd_error_model().

The start of this overly large patch was to simply move the test
for MODE_2D/3D flipping, which only affect NMEA 183, back into
driver_nmea0813.c

But that was intertwined with how gpsd_error_model() computes
derived variables, which required major changes to how NMEA 183
mode_2D/3D are set.

This ultimatly led to major regression test results.  Almost all for
the better.

I tried to break it up, but moving from one paradigm to another
needed one big jump...

1 files changed, 2 insertions, 0 deletions

diff --git a/gpsd.h b/gpsd.h
index cdf3c71b..ff54dfa9 100644
--- a/gpsd.h
+++ b/gpsd.h
@@ -54,6 +54,7 @@ extern "C" {
  *      time added to ATT
  * 3.14 Added RAW message class.
  *      Add cfg_stage and cfg_step, for initialization
+ *      Add oldfix2 for better oldfix
  */
 /* Keep in sync with api_major_version and api_minor gps/__init__.py */
 #define GPSD_PROTO_MAJOR_VERSION	3   /* bump on incompatible changes */
@@ -546,6 +547,7 @@ struct gps_device_t {
     bool cycle_end_reliable;		/* does driver signal REPORT_MASK */
     int fixcnt;				/* count of fixes from this device */
     struct gps_fix_t newdata;		/* where drivers put their data */
+    struct gps_fix_t lastfix;		/* not qute yet ready for oldfix */
     struct gps_fix_t oldfix;		/* previous fix for error modeling */
 #ifdef NMEA0183_ENABLE
     struct {