gps_data_t: Add datum field. Add decode for $PGRMM.

Sadly, $PGRMM is after a cycle ender and the data is never
reported, so no regression changes.  Cycle ender needs to get fixed...

1 files changed, 1 insertions, 0 deletions

diff --git a/gps.h b/gps.h
index d8dd21bb..e7b2fe9b 100644
--- a/gps.h
+++ b/gps.h
@@ -124,6 +124,7 @@ struct gps_fix_t {
 	double vx, vy, vz;	/* ECEF x, y, z velocity */
 	double vAcc;            /* Velocity Accuracy Estimate, probably SEP */
     } ecef;
+    char datum[40];             /* map datum */
 };
 
 /*