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What is Assisted GPS (A-GPS)? How does it work?

The Polar devices listed in the 'Related products' section below use Assisted GPS (A-GPS) to acquire a fast satellite fix. The A-GPS data tells your Polar device the predicted positions of the GPS satellites. This way the Polar device knows where to search for the satellites and thus is able to acquire signals from them within seconds, even under difficult signal conditions.

The A-GPS data updates once a day. The latest A-GPS data file is automatically updated to your Polar device each time you sync it with the Flow web service via FlowSync software. If you sync your Polar device with the Flow web service via Flow app, the A-GPS data file update takes place once a week.

The A-GPS data file is valid for up to 14 days. Positioning accuracy is relatively high during the first three days, and progressively decreases during the remaining days. Regular updates help to ensure a fast satellite fix.

How to keep the A-GPS data up to date?

You can check the expiry date for the current A-GPS data file from your Polar device. Go to SettingsGeneral settings > About your product/About your watch > A-GPS exp. date. If the data file has expired, sync your Polar device with the Flow web service via FlowSync software or with the Flow app to update A-GPS data.

Once the A-GPS data file has expired, more time may be required for acquiring the current position.

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