diff --git a/birdy-slim-iot/payload-formatters/gpsonly.js b/birdy-slim-iot/payload-formatters/gpsonly.js
new file mode 100644
index 0000000..cb1e0e1
--- /dev/null
+++ b/birdy-slim-iot/payload-formatters/gpsonly.js
@@ -0,0 +1,25 @@
+// TTN V2
+function Decoder(bytes, port) {
+  var decoded = {};
+  decoded.latitude = ((bytes[0]<<24)>>>0) + ((bytes[1]<<16)>>>0) + ((bytes[2]<<8)>>>0) + bytes[3];
+  decoded.latitude /= 10e4;
+  decoded.longitude = ((bytes[4]<<24)>>>0) + ((bytes[5]<<16)>>>0) + ((bytes[6]<<8)>>>0) + bytes[7];
+  decoded.longitude /= 10e4;
+  decoded.dur = bytes[8];
+  return decoded;
+}
+
+// TTN V3
+function decodeUplink(input) {
+  const bytes = input.bytes, data = {}
+  data.latitude = ((bytes[0]<<24)>>>0) + ((bytes[1]<<16)>>>0) + ((bytes[2]<<8)>>>0) + bytes[3];
+  data.latitude /= 10e4;
+  data.longitude = ((bytes[4]<<24)>>>0) + ((bytes[5]<<16)>>>0) + ((bytes[6]<<8)>>>0) + bytes[7];
+  data.longitude /= 10e4;
+  data.dur = bytes[8];
+  return {
+    data,
+    warnings: [],
+    errors: []
+  };
+}