diff --git a/pbf/index.js b/pbf/index.js
index 18fc3ff..e4560b3 100644
--- a/pbf/index.js
+++ b/pbf/index.js
@@ -12,7 +12,7 @@ async function run() {
     debug('run started...');
     const FeedMessage = gtfsRt.FeedMessage;
     debug('read gtfs-rt feed from file');
-    const buffer=fs.readFileSync('/tmp/vbn/gtfsr_connect.bin');
+    const buffer=fs.readFileSync('./vehicle-positions');
     if(buffer instanceof Buffer){
 	debug('buffer is instance of Buffer');
 	debug('read buffer and create pbf');
@@ -27,13 +27,20 @@ async function run() {
 	}
 	let feedCount=0;
 	feed.entity.forEach(entity => {
+	    debug('feed has entity at index: '+feedCount);
 	    feedCount++;
 	    const vehiclePos = entity.vehicle;
 	    if (vehiclePos) {
+		debug('entity has vehicle position');
 		const { trip, position, vehicle } = vehiclePos;
 		if (trip && position && vehicle) {
+		    debug('vehiclePos has either trip, position or vehicle');
+		    const latitude = position.latitude;
+		    if(latitude){
+			debug('position has latitude: '+latitude);
+		    }
 		}else{
-		    debug('vehiclePos misses either trip, position or vehicle');
+		    debug('vehiclePos misses either trip, latitude or vehicle');
 		}
 	    }else{
 		debug('entity misses vehicle');