diff --git a/scripts/navigation.gd b/scripts/navigation.gd
index 6c01fade..738b456c 100644
--- a/scripts/navigation.gd
+++ b/scripts/navigation.gd
@@ -24,7 +24,7 @@ class NaviSource extends unit.Unit:
         if not online:
             online = true
             emit_signal('line_changed', self)
-        if rx_data.size() < 26:
+        if rx_data.size() < 28:
             emit_signal('parse_failed', self)
             return false
         var flags: = rx_data.decode_u16(24)