System for offsite navigation

A system comprising:

• a private roads repository storing a plurality of private roads and a ghost road;
• a navigation service, executing on a computer processor, operatively connected to the private roads repository and configured to perform operations comprising:
• generating, by a navigation service, a route for navigating from a route origin to a route destination using the private roads repository;
• identifying a ghost origin and a ghost destination of a ghost road along the route;
• sending, using an application programming interface of a base roads engine, a first request for a route from the ghost origin to the ghost destination;
• receiving, from the base roads engine in response to the first request, a replacement section from the ghost origin to the ghost destination;
• replacing, in the route, the ghost road with the replacement section to create an updated route comprising a plurality of segments;
• generating an estimated travel time from the route origin to the route destination over the plurality of segments of the updated route;
• and
• presenting the estimated travel time.