diff --git a/main/managementinterface.go b/main/managementinterface.go
index 8332ce21..4343ff08 100644
--- a/main/managementinterface.go
+++ b/main/managementinterface.go
@@ -43,6 +43,9 @@ func handleWeatherWS(conn *websocket.Conn) {
 func handleTrafficWS(conn *websocket.Conn) {
 	trafficMutex.Lock()
 	for _, traf := range traffic {
+		if !traf.Position_valid { // Don't send unless a valid position exists.
+			continue
+		}
 		trafficJSON, _ := json.Marshal(&traf)
 		conn.Write(trafficJSON)
 	}
diff --git a/main/traffic.go b/main/traffic.go
index 3448d590..f646352f 100644
--- a/main/traffic.go
+++ b/main/traffic.go
@@ -96,7 +96,9 @@ func sendTrafficUpdates() {
 
 // Send update to attached client.
 func registerTrafficUpdate(ti TrafficInfo) {
-	trafficUpdate <- ti
+	if ti.Position_valid { // Don't send unless a valid position exists.
+		trafficUpdate <- ti
+	}
 }
 
 func makeTrafficReport(ti TrafficInfo) {