diff --git a/data/fields/seamark/platform/category.json b/data/fields/seamark/platform/category.json
new file mode 100644
index 00000000..1c171fec
--- /dev/null
+++ b/data/fields/seamark/platform/category.json
@@ -0,0 +1,14 @@
+{
+    "key": "seamark:platform:category",
+    "type": "combo",
+    "label": "Category",
+    "strings": {
+        "options": {
+            "oil": "Oil Rig",
+            "production": "Production Platform",
+            "observation": "Observation/research platform",
+            "fpso": "FPSO: Floating production, storage and off-loading vessel",
+            "accommodation": "Accommodation Platform"
+        }
+    }
+}
diff --git a/data/fields/seamark/radio_station/mmsi.json b/data/fields/seamark/radio_station/mmsi.json
new file mode 100644
index 00000000..be31217c
--- /dev/null
+++ b/data/fields/seamark/radio_station/mmsi.json
@@ -0,0 +1,7 @@
+{
+    "key": "seamark:radio_station:mmsi",
+    "type": "identifier",
+    "urlFormat": "https://www.vesselfinder.com/vessels/details/{value}",
+    "pattern": "^[0-9]{1,}$",
+    "label": "MMSI"
+}
diff --git a/data/presets/seamark/offshore_platform.json b/data/presets/seamark/offshore_platform.json
new file mode 100644
index 00000000..592f7fa3
--- /dev/null
+++ b/data/presets/seamark/offshore_platform.json
@@ -0,0 +1,40 @@
+{
+    "icon": "maki-harbor",
+    "fields": [
+        "name",
+        "seamark/platform/category",
+        "seamark/radio_station/mmsi"
+    ],
+    "geometry": [
+        "point",
+        "vertex",
+        "area"
+    ],
+    "tags": {
+        "seamark:type": "platform"
+    },
+    "addTags": {
+        "seamark:type": "platform",
+        "man_made": "offshore_platform"
+    },
+    "removeTags": {
+        "seamark:type": "*",
+        "man_made": "offshore_platform"
+    },
+    "terms": [
+        "bore",
+        "drilling rig",
+        "drilling rig",
+        "offshore platform",
+        "oil derrick",
+        "oil drill",
+        "oil horse",
+        "oil pump",
+        "oil rig",
+        "oil rig",
+        "petroleum well",
+        "platform",
+        "pumpjack"
+    ],
+    "name": "Offshore Platform"
+}