Reserved04, 03 02 and 01 look like they might be UTM coordinates (meters north and east of a zone boundary point), so you could compute meters to next turn by completing the triangle (they're effectively points on a grid).

Though thinking about it I think the mapsonus conversion script just uses the coordinates, the point types, the point descriptions, and the points on the lines which are the route, and you don't have a vector representation of the route here, just the waypoints.