Occasionally, satellite data can become obsolete or corrupt preventing your Forerunner 610 from acquiring a satellite lock. Performing an AutoLocate on your device removes all of the current satellite data on the device and allows it to re-establish a proper connection with the satellites.
You may also need to perform an AutoLocate in the following circumstances:
To perform the AutoLocate:
The Forerunner 610 will now have current satellite data, providing you with a good satellite lock, which will decrease the chance of inaccuracies in distance or speed. Keep in mind that GPS data continues to improve throughout the duration of an activity.