QUESTION:
What is the maximum effective search range/radius from the Pathfinder base
station?  Because you only have a limited time schedule, do you intend to
just stay close to base, or move further out, if anything in the distance
looks interesting?

ANSWER from J. Matijevic on July 29, 1997:
The nominal operating range of 'Sojourner' from the lander is approximately
10m (radial distance).  Beyond this range the rover does not subtend a
sufficient image in the IMP (lander camera) pictures to be localized or
otherwise supported in its hazard avoidance planning by ground operators. 
There remain plenty of interesting targets within 10m of our landing site
for the rover to explore.

We do plan to drive the rover further from the lander, using rover images to
substitute/augment the images from the IMP.  The range limit in that case is
nominally 500m, the range of communication between the rover and lander.