Suunto SPARTAN ULTRA 1.2 User Manual page 24

The GPS accuracy options are:
Best: ~ 1 sec fix rate with full power
•
Good: ~ 1 sec fix rate with low power
•
OK: ~ 60 sec fix rate with full power
•
When set to Best, your watch is using GPS at full power all the time.
In full power mode, the GPS is able to filter out interference and
get the best fix. This results in the best track accuracy, but also use
the battery the most.
By using Good, you can still get GPS fix every second, but the
accuracy is reduced because the GPS is not in full power mode all
the time. Between fixes, the GPS goes into a low power mode for a
short time, as illustrated below.
High
Low
This extends battery life, but it means the GPS has less time to find a
good fix and filter out interference. So the resulting track is not as
accurate as with Best.
With OK, the GPS fix rate is reduced to once every minute. This
significantly increases battery life, but results in a less accurate
track.
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1 sec 1 sec 1 sec 1 sec