received by the International Bureau on 31 July 2018 (31.07.2018)

1. A system for calculating a grade of a road, the system comprising:

at least two ride height sensors, each sensor configured for mounting to a vehicle in a mounting location and configured to detect a distance between the road and the mounting location;

one or more acceleration sensors configured for mounting to the vehicle, each sensor configured to detect acceleration of the vehicle along at least one axis;

one or more gyroscopes configured for mounting to the vehicle, each gyroscope configured to detect one of pitch, roll or yaw of the vehicle;

a global positioning unit configured for mounting to the vehicle, the global positioning unit configured to determine a geolocation of the vehicle;

a processor having a plurality of inputs, including at least one input connected to a data output from each of the at least two ride height sensors, at least one input connected to the one or more acceleration sensors, at least one input connected to the one or more gyroscopes, and at least one input connected to the global positioning unit, the processor configured to calculate road grade from the plurality of inputs and to associate the calculated road grade with geolocation of the vehicle associated with tiie calculated road grade; and

a computer memory connected to tiie processor configured to receive and store tiie calculated road grade and associated geolocation in a computer readable memory for a plurality of geoiocations along a path of the vehicle.

2. The system of claim 1, wherein one of the at least two ride height sensors is located relatively closer to a front of the vehicle and another of tiie at least two ride height sensors is located relatively closer to a rear of the vehicle.

3. The system of claim 2, wherein tiie at least two ride height sensors are each positioned on a centerline of tiie vehicle on a longitudinal plane parallel to the road.

4. The system of claim 1, wherein tiie one or more acceleration sensors comprise a first acceleration sensor configured to measure acceleration in an X direction, a second acceleration sensor configured to measure acceleration in a Y direction perpendicular to the X direction, and a third acceleration sensor configured to measure acceleration in a Z direction perpendicular to the X and the Y directions.

5. The system of claim 1, wherein tiie one or more gyroscopes comprise a first gyroscope configured to detect pitch of tiie vehicle, a second gyroscope configured to detect roll of the vehicle, and a third gyroscope configured to detect yaw of tiie vehicle.

6. The system of claim 1, wherein the one or more acceleration sensors and the one or more gyroscopes are integrated into an inertia! measuring unit

7. The system claim 1, further comprising a data collection unit connected to the at least two ride height sensors, the one or more acceleration sensors, the one or more gyroscopes, and the global positioning unit, the data collection unit configured to collect data comprising one or more of time, velocity, heading, height, vertical velocity, lateral acceleration, longitudinal acceleration, radius of turn, centerline deviation, pitch angle, roll angle, and yaw angle.

8. The system of claim 1, wherein the processor is configured to calculate the road grade in real time.

9. A vehicle comprising the system of claim 1.

10. A method for measuring a grade of a road, the method comprising the steps of:

providing the vehicle of claim 9;

moving the vehicle over the path and calculating, storing, and associating the plurality of road grades with the geolocations along the path.

11. A method for providing navigational information for a vehicle, the method comprising:

measuring the grade of a road associated with geolocations of the road in accordance with the method ofclaim 10; and

assodating the grade of the road with other road information corresponding to the same geolocations and storing the associations in a navigational database.

12. The method of claim 11, further comprising providing the grade of the road to a user of the navigational database.

13. A method for testing a vehicle, the method comprising:

providing a vehicle to be tested;

providing a dynamometer configured to receive the vehide to be tested;

selecting a virtual path for testing of the vehicle by simulated driving of the vehicle along a virtual path;

providing navigational information corresponding to the virtual path, the navigational information comprising road grade information associated with geolocations along the virtual path; and

moving the dynamometer in accordance with the road grade information in the navigational database during the simulated driving of the vehide.

14. The method ofclaim 13, wherein the road grade information associated with the geolocations is provided in accordance with the method of claim 12. 15. A navigational device comprising:

an input for receiving a geolocation command; and

a processor in communication with a computer memory having stored navigationai information corresponding to geolocation information, the processor 5 configured to retrieve the stored navigationai information from a database including road grade information stored in the database.

16. The device of claim 15 further comprising an output configured to display the road grade information.

17. The device of daim 15, wherein the processor is further configured to 10 recommend a path between two or more geolocation points entered by a user in

accordance with recommendation criteria, wherein the recommendation criteria includes said road grade information.

18. The device of daim 15, wherein the input for receiving the geolocation command indudes a receiver configured to receive geolocation information

15 corresponding to a position of the device.

19. The device of daims 17 or 18, wherein the input for receiving the geolocation command includes a user input for specifying the at least two geolocation points.

20. The device of claim 15, further comprising the computer memory 20 integrated into the device.

21. The device of claim 15, further comprising a transceiver configured to transmit and receive information from a global computer information network, wherein the computer memory is connected to the global computer information network and not integrated into the device.

25 22. A system for testing a vehicle, die system comprising:

a dynamometer configured to receive the vehide to be tested;

a user input for selecting a virtual path for testing the vehicle by simulated driving of the vehicle along the virtual path, the virtual path corresponding to an existing physical path; and

30 a processor configured to access navigational information comprising road grade information associated with geolocations along the physical path corresponding to the virtual path and to move the dynamometer in accordance with the road grade information during the simulated driving of the vehide along the virtual path.