1 files changed, 5 insertions, 4 deletions

diff --git a/13.-Appendix.md b/13.-Appendix.md
index a03a0f1..6905f5e 100644
--- a/13.-Appendix.md
+++ b/13.-Appendix.md
@@ -48,10 +48,11 @@ The output format CSV ordering is as follows:
 8. Station ID : (Name of the KrakenSDR station inputted in the Station Information box in the Web GUI),
 9. Latitude,
 10. Longitude,
-11. Heading,
-12. Heading Sensor Used ("GPS"/"Compass"),
-13-16. Reserved for possible future use,
-17-377. Full 360 degrees DOA output. First element specifies DOA power output at 0 degrees, second element power at 1 degrees etc. NOTE: Uses unit circle convention, so due EAST is classed as 0 degrees, NORTH 90 degrees and so on. Needs to be rotated into compass convention.
+11. GPS Heading,
+12. Compass Heading (if available),
+13. Main Heading Sensor Used ("GPS"/"Compass"),
+14-17. Reserved for possible future use,
+18-377. Full 360 degrees DOA output. First element specifies DOA power output at 0 degrees, second element power at 1 degrees etc. NOTE: Uses unit circle convention, so due EAST is classed as 0 degrees, NORTH 90 degrees and so on. Needs to be rotated into compass convention.
 ```
 If multiple VFO channels are used, each channel will output it's own unique CSV data from 1-377 separated by a newline character "\n".