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-rw-r--r--www/NMEA.adoc7
1 files changed, 6 insertions, 1 deletions
diff --git a/www/NMEA.adoc b/www/NMEA.adoc
index 6c2ab428..d61f27e3 100644
--- a/www/NMEA.adoc
+++ b/www/NMEA.adoc
@@ -1127,7 +1127,12 @@ Field Number:
10. Goeidal separation meters
11. Age of diferential data
12. Differential reference station ID
-13. Checksum
+13. Navigational status (optional)
+ S = Safe
+ C = Caution
+ U = Unsafe
+ V = Not valid for navigation
+14. Checksum
The Mode indicator is two or more characters, with the first and second
defined for GPS and GLONASS. Further characters may be defined. For