Odometer is to mileage as compass is to

An odometer is an instrument that is generally installed in vehicles to measure the distance traveled by the vehicle. By knowing the amount of fuel used to cover the distance, we can calculate the mileage of the vehicle. Mileage is basically the number of miles or distance covered by a vehicle in a particular amount of fuel.

A compass is a tool is used in navigation. It consists of a magnetic pointer that points in the north direction. Hence we can say the compass is used to find the direction.