diff --git a/src/cam.c b/src/cam.c
index 60bc9fd..cc4b7be 100644
--- a/src/cam.c
+++ b/src/cam.c
@@ -437,7 +437,7 @@ int lightship_check() {
 
             // Check heading delta > 4º
             int diff = epv.space.data.heading.value - lightship->last_pos.heading;
-            diff += (diff > 180) ? -360 : (diff < -180) ? 360 : 0;
+            diff += (diff > 1800) ? -3600 : (diff < -1800) ? 3600 : 0;
             if (abs(diff) > 40) rv = 1;
 
             if (!rv) {