diff --git a/schemas/cloudToDevice/ground_fix/ground-fix-example-with-ts.json b/schemas/cloudToDevice/ground_fix/ground-fix-example-with-ts.json
new file mode 100644
index 0000000..5b0e567
--- /dev/null
+++ b/schemas/cloudToDevice/ground_fix/ground-fix-example-with-ts.json
@@ -0,0 +1,11 @@
+{
+    "appId": "GROUND_FIX",
+    "messageType": "DATA",
+    "ts": 1759999147091,
+    "data": {
+        "lat": -45,
+        "lon": 100,
+        "uncertainty": 500,
+        "fulfilledWith": "WIFI"
+    }
+}
diff --git a/schemas/cloudToDevice/ground_fix/ground-fix.json b/schemas/cloudToDevice/ground_fix/ground-fix.json
index 4fd7ed6..aac1d49 100644
--- a/schemas/cloudToDevice/ground_fix/ground-fix.json
+++ b/schemas/cloudToDevice/ground_fix/ground-fix.json
@@ -11,6 +11,10 @@
           "type":"string",
           "const":"DATA"
        },
+        "ts": {
+            "type": "number",
+            "description": "Unix timestamp given in milliseconds when the data was sampled"
+        },
        "data":{
           "type":"object",
           "properties":{
diff --git a/schemas/deviceToCloud/ground_fix/ground-fix-example-with-ts.json b/schemas/deviceToCloud/ground_fix/ground-fix-example-with-ts.json
new file mode 100644
index 0000000..e0fc369
--- /dev/null
+++ b/schemas/deviceToCloud/ground_fix/ground-fix-example-with-ts.json
@@ -0,0 +1,42 @@
+{
+    "appId": "GROUND_FIX",
+    "messageType": "DATA",
+    "ts": 1759999147091,
+    "config": {
+        "doReply": true,
+        "hiConf": false,
+        "fallback": true,
+        "cont": false
+    },
+    "data": {
+        "wifi": {
+            "accessPoints": [
+                {
+                    "macAddress": "fd:70:40:b9:58:dc"
+                },
+                {
+                    "macAddress": "c5:ab:c7:55:8d:e3"
+                }
+            ]
+        },
+        "lte": [
+            {
+                "mnc": 260,
+                "mcc": 310,
+                "eci": 21858829,
+                "tac": 333,
+                "rsrp": -157,
+                "rsrq": -34.5,
+                "earfcn": 41490,
+                "nmr": [
+                    {
+                        "pci": 143,
+                        "earfcn": 41490,
+                        "rsrp": -44,
+                        "rsrq": -3.5
+                    }
+                ]
+            }
+        ]
+    }
+}
diff --git a/schemas/deviceToCloud/ground_fix/ground-fix.json b/schemas/deviceToCloud/ground_fix/ground-fix.json
index 0dc7cd2..d9aa2d9 100644
--- a/schemas/deviceToCloud/ground_fix/ground-fix.json
+++ b/schemas/deviceToCloud/ground_fix/ground-fix.json
@@ -11,6 +11,10 @@
             "type": "string",
             "const": "DATA"
         },
+        "ts": {
+            "type": "number",
+            "description": "Unix timestamp given in milliseconds when the data was sampled"
+        },
         "config": {
             "type": "object",
             "properties": {