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My Garmin Fenix 5 Is VERY Inaccurate In Measuring Short-Distance Open Water Swims.

by Anura Guruge


Click images to ENLARGE.



Two Very Different GPS tracks for what is the SAME swim everyday!

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As you can see from the first figure I started Open Water Swimming in our lake on July 1, 2018, and have tried to do so daily, weather and schedule permitting.

We have been at this lake for the last 11-years and my swim never varies. I start as close to head-on with the swim platform — when the water is waist deep. I then swim to the platform and back again — until I can’t swim any further because the water is too shallow. So, the top GPS track is accurate. I swim longer on the return leg — and it is possible, mainly due to wind, that my return leg is slightly ‘off course’ though I try to swim in a straight line using a marker on the beach for reference.

I have not as yet measured the distance, but I am fairly sure that the distance to/from the swim platform is more than 34 yards — per one of the readings. That would ~17 yards (51′) one-way. That would be the length of 2.5 twenty-foot boats. I know the swim is further than that.

Part of this has to be GPS accuracy. The distance here might be TOO SHORT for GPS to get a good handle. With Open Water Swimming the Fenix 5 uses GPS, the accelerometer and the gyroscope to estimate distance and movement. I noticed the other day that the distance jumped significantly after I had finished my swim and stood up.

I am not impressed.

Yet ANOTHER definicecy in the supposed ‘Leader-of-the-PackGarmin Fenix 5. Another disappointment.


Related posts:
Search ‘Garmin’.


by Anura Guruge

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About Anura Guruge

See 'The Blogger' on my https://nhlifefree.com/ blog.

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