It's only available in the online portal, and it's a bit cranky in how it "works", you have to add a location to be part of a route, and then you can favourite star that location, and it get sync'd to the Nyon. It's also a bit crap, as it takes the address, not the name as shown in the UK, so unless you have encyclopedic knowledge of what address is what business, there is no real way of knowing what is what. You then need to go into the favourites tab and give everything a more meaningful name.