Themi thermal locator

Anybody have information on the Themi thermal locator?
Check news at www.eglider.org

My guess is the device is using GPS position and altitude,
along with some math to determine which direction you
are currently turning, and then to 'guess' where the
thermal core is. The device then lights a light telling
you which wing to level so you will head toward this
thermal core location.

For example, if you turn away from the thermal (into
sink, for example), simple math on the GPS data will
show you with a decreasing climb rate along with a
bearing change (direction) that you are heading away
from the thermal. Would be very simple to monitor
the heading changes and signal (with a light) to raise
your wing (bearing change would tell you which wing
needs to come up), thereby stopping any further heading
changes as your swing around and point back to the
'good lift'.

Basically, do with software and the GPS data the 'circle
shifting' we do in our head.

Can this be programed into a PDA?