I have written a little App for the Pebble Watch to assist with tracking of PICOSPACE balloons, starting with PS-30.
The watch displays the time from last telemetry, lat, long, altitude, speed, battery voltage and solar voltage.
The data is polled from picospace.net (via the phone) every two minutes. You will need internet connectivity from your phone (3G or Wifi).
If new telemetry is received after 30 minutes from last telemetry the watch will also vibrates.
The screen shot show PS-30 was heard from 7 hours 14 minutes ago, at 9697m, and speed of 216kmph.
Click this link from your phone to install the Pebble Watch Apps