Reducing the time taken for a Garmin Edge 25 to find a satellite signal

Regular readers will know that cycling is one of my hobbies (with my eldest son looking like he may follow in the same direction…).

I have a Garmin Edge 810 cycle computer to use on my big rides but for commutes (e.g. on the Brompton) I use a smaller unit – an Edge 25. The Edge 25 is a cracking little unit, with all the basic functionality I’d expect and Bluetooth connectivity, but one of the issues I’ve found is that it can be slow to pick up a GPS signal.

I think I may have made a breakthrough though, thanks to a comment in this review from Average Joe Cyclist:

“Satellite Acquisition on the Garmin Edge 25
The Garmin Edge 25 can connect to both GPS and GLONASS satellites. As it has more satellites to choose from, it can lock in faster. I know that Garmin Edge bike computers with only GPS can be frustratingly slow to lock in, so this is important. It was a very happy surprise to find GLONASS on such a relatively cheap bike computer as the Garmin Edge 25. This is obviously a huge selling point for this tiny bike computer.

Note: GPS and GLONASS are different kinds of satellite systems – the GPS was developed by the USA, and the GLONASS is Russian.”

Sure enough, I checked my settings and GLONASS was off. So I turned it on and limited testing suggests that it may now be faster to pick up a satellite. Time will tell, as will experience with the second Edge 25 that’s in the post for my son to use…

Some more reading suggests that using GLONASS and GPS together may affect battery life but could also improve accuracy. If satellite lock-in is still slow, then a master reset may be required. To reset the Edge 25:

  1. Power on the device whilst holding the two right-side buttons down.
  2. Release the top button when you hear the first beep.
  3. Release the bottom button when you hear the second beep.

Garmin Edge software version as viewed in Garmin ConnectI also upgraded the firmware (unfortunately breaking the rule of only changing one thing at a time when troubleshooting tech…) which got me thinking “what firmware did I have before?”. It seems the way to tell this is to view an activity in Garmin Connect, where the details of the device used to upload the data shown on the right-hand side.

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