make readme more consistent

README.md

@@ -17,13 +17,14 @@ Either use the Manage Palette option in the Editor menu, or run the following co
 
         npm i --save node-red-contrib-web-worldmap
 
+
 ## Usage
 
 Plots "things" on a map. The map will be served from `{httpRoot}/worldmap`
 
 The minimum **msg.payload** must contain `name`, `lat` and `lon` properties, e.g.
 
-        {name:"Joe", lat:51, lon:-1.05}
+        msg.payload = { name:"Joe", lat:51.05, lon:-1.35 }
 
 `name` must be a unique identifier across the whole map. Repeated location updates to the same `name` move the point.
 
@@ -73,7 +74,7 @@ There are also several special icons...
 You can use NATO symbols via <a href="https://github.com/spatialillusions/milsymbol" target="_new">milsymbol.js</a>.
 To do this you need to supply a `msg.SIDC` instead of an icon, for example:
 
-    {   name: "Emergency Medical Operation",
+    msg.payload = { name: "Emergency Medical Operation",
         lat: 51.05,
         lon: -1.35,
         SIDC:"ENOPA-------",
@@ -88,7 +89,7 @@ The OSM Buildings layer is available in the layers menu. You can replace this wi
 sending a msg.payload containing a name and a building property. The building property should be
 a GeoJSON Feature Collection as per the OSMBuildings spec.
 
-    { name:"My Block", building: {
+    msg.payload = { name:"My Block", building: {
         "type": "FeatureCollection",
         "features": [
           {
@@ -137,7 +138,7 @@ then rather than draw a point and icon it draws the polygon. Likewise if it cont
 If the payload contains a **radius** property, as well as name, lat and lon, then rather
 than draw a point it will draw a circle. The *radius* property is specified in meters.
 
-    { lat:51.05, lon:-1.35, name:"A3090", radius:3000 }
+    msg.payload = { lat:51.05, lon:-1.35, name:"A3090", radius:3000 }
 
 As per Areas and Lines you may also specify *iconColor*, and *layer*.