Automatically Emit watchPosition() with socket.io without JS Interval

I'm looking for a way to listen in for when watchPosition() gets a new gps coordinate and then emit this automatically without using a javascript interval to blindly keep emiiting the values of watchPosition() with or without a change in the device's location.

Basically, update the latitude and longitude only when the device's location changes.

Thanks in advance!

via William Ebuka Okafor