Re the map, you can use the Map Theme which shows the map with events, it's usually one or the other. carcam should be able to confirm if we can extend this or not to be based of the logged in user.
As far as the "distance unit" for map, it will be great if it changes by Geo Location. If it is in USA = "miles" if it is not in USA 'km". (But not lock it for traveling users who may want to switch to a distance unit they are accustomed to.)