Q: Using Watch 2 as a tracker

Hi

Apple has not disclosed details of any built-in tracking features.

More information about iOS 10, watchOS 3 and any new built-in features will become available in due course, as software and hardware are released. 

You're welcome!

gps is only a receiver it receive the positions of the satellites and and can calc where it is

without being connected to wifi, bluetooth or cellular it can't pass on the information as to it's location to anybody

and it does not have build in cellular so, when it's outside of bluetooth or wifi range of the phone you lose track