You can track device speed with GPS modem.
You can use this modem to get precise co-ordinates about its location.
But this device do not give you co-ordinates directly. You have to do some data processing to convert the GPS data to convert to co-ordinates.
We can help you with this, we can convert your GPS data to co-ordinates.
once you have the co-ordinates you can enter them in any of the mapping software like google maps and you will get the location mapped.