diff --git a/models/ShipEngine.json b/models/ShipEngine.json
index 65cae0b..3a1d032 100644
--- a/models/ShipEngine.json
+++ b/models/ShipEngine.json
@@ -31,6 +31,7 @@
   "required": [
     "symbol",
     "name",
+    "description",
     "speed",
     "requirements"
   ]
diff --git a/models/ShipFrame.json b/models/ShipFrame.json
index 2bb856e..e171deb 100644
--- a/models/ShipFrame.json
+++ b/models/ShipFrame.json
@@ -49,6 +49,7 @@
   "required": [
     "symbol",
     "name",
+    "description",
     "moduleSlots",
     "mountingPoints",
     "fuelCapacity",
diff --git a/models/ShipNav.json b/models/ShipNav.json
index 400ce4b..4250faf 100644
--- a/models/ShipNav.json
+++ b/models/ShipNav.json
@@ -2,6 +2,10 @@
   "type": "object",
   "description": "The navigation information of the ship.",
   "properties": {
+    "systemSymbol": {
+      "type": "string",
+      "description": "The system symbol of the ship's current location."
+    },
     "waypointSymbol": {
       "type": "string",
       "description": "The waypoint symbol of the ship's current location, or if the ship is in-transit, the waypoint symbol of the ship's destination."
@@ -17,6 +21,7 @@
     }
   },
   "required": [
+    "systemSymbol",
     "waypointSymbol",
     "route",
     "status",
diff --git a/models/ShipReactor.json b/models/ShipReactor.json
index d6573f9..53614d7 100644
--- a/models/ShipReactor.json
+++ b/models/ShipReactor.json
@@ -32,6 +32,7 @@
   "required": [
     "symbol",
     "name",
+    "description",
     "powerOutput",
     "requirements"
   ]
diff --git a/models/WaypointTrait.json b/models/WaypointTrait.json
index 97b68c1..a4e4287 100644
--- a/models/WaypointTrait.json
+++ b/models/WaypointTrait.json
@@ -62,9 +62,7 @@
         "BARREN",
         "TEMPERATE",
         "JUNGLE",
-        "OCEAN",
-        "MARKETPLACE",
-        "SHIPYARD"
+        "OCEAN"
       ]
     },
     "name": {