Navigating a saved google map

[theguest13]

Im going on a trip tomorrow and I've saved a map from the desktop to my google account, when I go into my maps on my Galaxy Nexus I can load my saved map, however i want to Navigate the map and can't quite figure out if i actually can or not. I've had to save it as it has a via.

Can anyone point me in the right direction?

Thanks.