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-rw-r--r--src/drivers/gps/ashtech.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/drivers/gps/ashtech.cpp b/src/drivers/gps/ashtech.cpp
index 614aade00..b37f70ad1 100644
--- a/src/drivers/gps/ashtech.cpp
+++ b/src/drivers/gps/ashtech.cpp
@@ -293,7 +293,7 @@ int ASHTECH::handle_message(int len){
double track_rad = track_true * m_pi / 180.0;
- double velocity_ms = ground_speed / 3.6;
+ double velocity_ms = ground_speed / 1.9438445; /** knots to m/s */
double velocity_north = velocity_ms * cos(track_rad);
double velocity_east = velocity_ms * sin(track_rad);