#27, #33 - Adjusted initial position and distance increment for
simulated GPS.  Fixed calculation errors (kilometers vs. meters) in
distance calculation.  Boundary conditions mentioned in previous commit
tested successfully.  Speed and pace values appear to be valid.
Speed/pace varies immediately after a paused timer, but for now I'll
leave it as is.  This appears to be due to jitter between the GPS update
rate and the timer rate.  Need to decide what to do on this front.  The
specification indicates the watch stores one track point per second, but
the simulated GPS produces a new location every two seconds.