Accuracy is not good:
E.g. walking workout, according to Sportstracker max speed was 34.3 km/h!
In reality it was 12 or 13 km/h.
Also the route went on a lake. Of course, I don't have the ablility to walk over waters :) :)
From start to midpoint 6,6 km and back the same route 7,2km...

Driving workout, according to Sportstracker max speed was 158 km/h
In reality it was 90 km/h.

It stores the points about once in a minute. It should do so let's say every 10 seconds.
The points are not accurate. The calculated point can differ from the real place 50m.
I have version 2.06, phone is N95 8GB.