TOPO 100K maps do not include routable roads

The TOPO Maps selection features  road content provided by HERE. However, these maps does not contain routable data. In order to create routes using these maps, point-to-point routes will need to be manually created on compatible devices.

If routable maps are preferred, consider City Navigator® North America NT. This map includes the necessary routable data and can be used to automatically calculate routes on supported devices.