ps use BaseCamp to create your route and send to the 30 it will work much better
and don't disconnect the device until it's absolutely completely finished communicating with the device or else it'll likely not do anything when you fire it up;
if you do it all properly and Caerphilly it will navigate you with all the arrows
but you may well need a map of some sort on your pc to plot the route
ask me how I know this...