Question

A device which tells the speed and position of an object

Answer 1

I think it is the radar

Answer 2

Calculating any moving object's speed and current location is one of the most important part of different scientific studies and research works.

Actually there is no such device to do so.

We use different tracking systems which contains multiple devices and equipments to calculate the velocity and the current location of a particular object.

The most common tracking systems are,radar system and GPS navigation system etc.