Tag Archive | gyroscope

Garmin’s New ‘Swim 2’ For Pool & Open Water Swimmers — I Am Skeptical. (Sorry.)

by Anura Guruge


Click to ENLARGE. From ‘garmin.com’, of course.


It BETTER be better than the Fenix 5
in Open Water
BUT it doesn’t have a gyroscope. 

Click to access my post from last year. Actually I did a couple of posts on this topic.


This Garmin amused I. I do NOT consider myself a swimmer. Given that I do live in a lake community, with beach rights, I do swim ‘open water‘ in the Summer — but, I do live in New Hampshire, and this year, Summer was about 3-weeks long. (SMILE). If I am travelling, and staying at a hotel with a pool, I will swim, religiously — but I do not go swimming, in pools, other than when I am staying at a hotel (which is ~ 20 — 25 days a year).

That this ‘baby’ doesn’t have a gyroscope cracks me up.

GPS does NOT work underwater. That is why you need a gyroscope. The gyroscope is supposed to backfill data IN BETWEEN GPS reading. With the Fenix 5, with a gyroscope, this was still the challenge. The Fenix 5 did not keep up between GPS readings.

I HOPE Garmin has fixed all of the ‘open water’ issues in this — the ‘Swim 2’. As a huge Garmin fan (as well as a Garmin shareholder) I always want Garmin to WIN. Thus, though I am skeptical I am rooting for this watch to be a winner.

I did a bit of research. It, at its core, is a Garmin Forerunner 45 — with the special software adding $50 to the price. Interesting choice. It would appear that what Gramin was most concerned about was the $250 price point.

Well, I will keep an eye on this as I do with most Garmin watches. I will check the Forums.

No I am not going to get one. As I started off, I am not a swimmer.

I will be happy to share any feedback or updates you share with me. Thank you.


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by Anura Guruge

The New ‘Polar Vantage V’ Sports Watch — Good Looking, But I Am Still Keeping My Garmin Fenix 5.

by Anura Guruge


Click to ENLARGE.



Its announcement last week, by Polar, had slipped under my radar. I did NOT see it on any of my news feeds and most of them go out of their way to keep me abreast of new smart watches. That actually might have been the issue. Polar is positioning it, squarely and uncompromisingly, as a ‘Premium GPS Multisport‘ Watch. I only heard about it when a contact in the industry send me an e-mail.

I had a quick look. Sure looks nice. I like the display.

But, from what I can see, and I only got to spend a few minutes with the spec., it is not exactly a head-to-head Garmin Fenix 5 competitor.

For a start, from what I can see, it does not have a gyroscope. And to that end I notice it does NOT mention open water swimming.

There is also no mention of stress monitoring. Not a biggie, but something I use.

I might, with luck, get a chance to check it out. That would be interesting.

Its price puts it firmly in Garmin Fenix 5 territory.

Interesting. I have never owned or worn a Polar but I know that it is popular among the diehard crowd.


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by Anura Guruge

Garmin Fenix 5 ‘Open Water Swim’ Distance Tracking Is A JOKE!

by Anura Guruge


Click images to ENLARGE.


From Google Maps — independent of Garmin.


My prior post from July 12, 2018.

Click image to access post.

 



Please refer to my July 12, 2018, post for background.

Garmin contacted me when I TWEETED about this and yesterday I sent them the information requested.

Today, I decided to check this out further and what I found totally disgusted me! The Garmin Fenix 5 ‘open swim’ distance measuring is a JOKE.

I ONLY swim the DOG-PADDLE so my Fenix 5 is always underwater. I appreciate that. But, per Garmin that is where the Fenix 5’s gyroscope kicks into help keep track of the distance.

So, this is what I found.

Invoked ‘Open Swim’ and waited until there was a GPS fix. I was basically walking up to my swimming depth while this was happening.

Then, with GPS active, pressed ‘START’, dove in and started swimming. Given it is in total 10-minutes, I must have swum 5-minutes to the swim platform. Grabbed the ladder and LIFTED my left arm, with the Fenix 5, out of the water.

The distance read 9 yards! There was no way that I had only smum 27′ (4.5 time my body length).

But, as I was holding the Fenix up, above the water, the distance started going up … LIKE CRAZY.

OK. So, that was good. The GPS was catching up.

It went … 19, 37, 50, 59, 65, 66 ….

All this time, I am totally stationary, holding onto the ladder. It is no longer funny.

So. I let go the ladder and start swimming back.

The swim back is a bit longer since I swim until there is not enough depth to swim.

Stood up. Looked at Fenix 5. It said 97 yards.

Then, immediately, 111 and then, as it had done at the swim platform, it kept on going.

I had enough. I hit STOP in disgust.

This is not funny.

Open Water Swim‘ is a BIG feature on the Fenix 5 — and it doesn’t work.

Don’t get me wrong. I am not a Garmin basher. I am actually a long-term Garmin shareholder!


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by Anura Guruge

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!

** ** ** ** ** **


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.


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by Anura Guruge

Garmin Activity/Fitness Trackers — Issue With ‘Pool Swim’ vs ‘Open Water Swim’.

by Anura Guruge



Click to ENLARGE.


Click to ENLARGE.


This issue as to the difference between ‘Pool Swim‘ vs. ‘Open Water Swim‘ comes up repeatedly in the context of Garmin activity/fitness trackers/watches such as the Vivoactive 3 and Forerunner 645.

The Vivoactive 3 and Forerunner 645, in particular, do NOT support ‘Open Water Swim’ though they do support ‘Pool Swim’.

This distinction and restriction drives folks nuts, so, I decided to get to the bottom of it.

It has all to do with GPS/Glonass support — or lack thereof IN WATER.

GPS does not work very well when the sensor is submerged in water. THAT IS THE CRUX OF THE ISSUE.

If you just want a GPS distance and track while you swim in open water you could try putting your watch into running mode and having it attached to a swim cap. That is supposed to work.

‘Pool Swim’, by definition, means that GPS is DISABLED. Pool swim data is measured using the ACCELEROMETER. Got that? No GPS … just accelerometer.


So, how do the more expensive watches like the Garmin Forerunner 935 and Fenix 5 support open water swimming? They use the GYROSCOPE.

With the gyroscope you only need occasional GPS fixes. The gyroscopes fills in the gaps between the GPS readings. The Vivoactive 3 does NOT have a gyroscope. Hence why open water swim is not available.

But, alas, a gyroscope alone is also NOT enough. For open water swim you ALSO need a powerful enough CPU to continually calculate the data. Got that?

Hence why open water swim is not supported on the Forerunner 645 though it has a gyroscope. The CPU in it is not as powerful as that in a FR935. Got that.


So, that is the deal.

To get open water swim support you need a gyroscope and a big enough CPU. Without that you only get pool swim which only uses the accelerometer.

You can TRY and use running or pool swim in open water — though the results will be mixed and most likely inaccurate.

So, that is the story. Now you know.


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by Anura Guruge 

Lot Of Fun, Educational, Interactive Pendulum Google Doodle For French Physicist Léon Foucault 194th Birthday.

Anura Guruge, June 8, 2013.

..
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by
Anura Guruge


PendulumSept18Latest Google Doodle posts:
>>
American Jane Addams’ 153rd birthday
>>
Sep. 6, 2013.
>> John Wisden, 187th birthday — Sep. 15, 2013.
>> Google Doodle for my birthday — Sep. 4, 2013.

≡ ≡ ≡ ≡ Check CATEGORY ‘Google Doodle’ for other posts —>>> (side bar)


PendulumGDSep18

Click image to access.

The motion of the pendulum changes per latitude. The second slider lets you see it at different latitudes.
The first slider appears to adjust the speed.

Link updated
to provide access to Doodle from the Google Doodle Archive.


Boston pendulum (from Erica Green’s ‘The Little Review’ blogspot, with thanks.

Foucault pendulums intrigue, fascinate, mesmerize and puzzle me. Yes, of course, having done tons of physics even at college level, I understand the principle. I collect and play with gyroscopes (and break quite a few too in the process so that I am always short). So I know all of that, though until today I did not realize that Léon Foucault came up with the name ‘gyroscope‘, though he was by no means the inventor. While I appreciate the preservation of motion through the gyroscopic action what I don’t get is

The book. I don't think I have read it. One book by Eco was enough for me, I think.

The book. I don’t think I have read it. One book by Eco was enough for me, I think.

The Panthéon in Paris, where Léon Foucault publicly demonstrated his giant pendulum is one of my favorite buildings in Paris. It was quite close to where my adoptive parents lived in Paris, 1978 to 1992. So I would wonder in quite often. I know I have seen ‘the pendulum’ in Paris but after so many years I can’t vouch that I did see the replica now at the Panthéon. I do go and gwak, for as long as possible (until Deanna comes and drags me away) at the absolutely beautiful pendulum, tucked away in the corner, at the Boston Museum of Science. Just captivates me. What I don’t still get is why the rotation of the hook that it is attached doesn’t dampen the motion. I will have to look into this.

Here is a good article on the physics of the pendulum from Wikipedia.


Educational & fun slideshow on pendulums. Worth watching.

Educational & fun slideshow on pendulums. Worth watching.


Click to access Wikipedia entry.

Click to access Wikipedia entry.


Educational video on Foucault's pendulum showing one at the Paris Pantheon.

Educational video on Foucault’s pendulum showing one at the Paris Panthéon. Click to access.


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