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From Fellrnr.com, Running tips
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# Leave the 620 in "ready to go" mode with a good view of the sky for at least 20 minutes. There is information (the almanac) that can take 12.5 minutes under ideal conditions to download from the satellites. In theory the 620 should get all of the satellite data from the EPO file, but the almanac might help.
# If none of these steps work, do a factory reset.
=What's Missing=
While I don't consider these missing features as 'cons', it's worth understanding the features that are missing compared with other watches.
* '''Altimeter. '''GPS is far less accurate vertically than horizontally, so a barometric altimeter can provide a much better idea of your ascent and descent. It can also be useful for navigation if you're ascending or descending a mountain. In some races I've been far more interested in how much ascent is left rather than the distance to the top.
* '''Navigation.''' The navigation capabilities are useful if there is a risk of getting lost. I've made good use of this feature when running in an unfamiliar city, or when running remote trails.
* '''Downloadable Apps'''. Smart watches have got is used to the idea of a device that can be extended with new functionality, and this concept is being introduced to running watches.
* '''Extended battery life'''. Some porches can extend the battery life by turning the GPS reception off for short periods. This can dramatically reduce GPS accuracy, but it's a useful trade-off for some ultramarathons.
* '''Graphs'''. Instead of simply displaying a numeric value for things like heart rate, some watches will display a graph of the value over time, giving you a sense of how things are progressing.
{{BuyAmazon|AZID=B00FBYYC90|AZN=Garmin 620}}
=Comparison Table=
{{:Best Running Watch-table}}
