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Assisted GPS (A-GPS)

The M430 has built-in GPS that provides accurate speed, distance and altitude measurement for a range of outdoor sports, and allows you to see your route on map in the Flow app and web service after your session.

M430 uses Assisted GPS (A-GPS) to acquire a fast satellite fix. The A-GPS data tells your M430 the predicted positions of the GPS satellites. This way the M430 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 M430 each time you sync it with the Flow web service via FlowSync software. If you sync your M430 with the Flow web service via Flow app, the A-GPS data file update takes place once a week.

A-GPS expiry date

The A-GPS data file is valid for up to 13 days. Positioning accuracy is relatively high during the first three days, and progressively decreases during the remaining days. Regular updates help to ensure a high level of positioning accuracy.

You can check the expiry date for the current A-GPS data file from your M430. In M430, go to Settings > General settings > About your product > A-GPS exp. date. If the data file has expired, sync your M430 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.

GPS features

M430 includes the following GPS features:

  • Altitude, ascent and descent: Real-time altitude measurement, as well as ascended and descended meters/feet.
  • Distance: Accurate distance during and after your session.
  • Speed/Pace: Accurate speed/pace information during and after your session.
  • Running index: In M430, Running Index is based on heart rate and speed data measured during the run. It gives information about your performance level, both aerobic fitness and running economy.
  • Back to start: Directs you to your starting point in the shortest distance possible, as well as shows the distance to your starting point. Now you can check out more adventurous routes and explore them safely, knowing that you're only a touch of a button away from seeing the direction to where you started.
  • Power save mode: Allows you to save the battery life of your M430 during long training sessions. Your GPS data is stored at intervals of 60 seconds. A longer interval gives you more recording time. When power save mode is on, automatic pause cannot be used. In addition, Running Index cannot be used unless you have a stride sensor.

For best GPS performance, wear M430 on your wrist with the display facing up. Due to the location of the GPS antenna on the M430, it is not recommended to wear it with the display on the underside of your wrist. When wearing it on the handlebars of a bike, make sure the display is facing up.