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Kitesurf Jump height measurements......... on your smartwatch?

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Created by dachopper Two weeks ago, 1 May 2022
dachopper
WA, 1633 posts
1 May 2022 9:46PM
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Hey people, is anyone keen for an app that measures kitesurf jump heights using a smartwatch - not requireing anything else apart from the watch?

I know a few of the manufacturers have various " altitude " readouts, but these are pretty much useless for the purpose of jump heights.

Nick

Phoney
NSW, 537 posts
2 May 2022 9:37AM
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My Garmin Epix2 does that with the WooKite app. It vibrates and displays the jump height & duration immediately after each landing. But yeah it needs the woo.

Kiterr12
WA, 2 posts
2 May 2022 9:08PM
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Hey

Garmin watches are great to see the hight of your jumps on,
but you still need a device that measure your jumps like the woo on your board or your phone with the surfr app in your wetsuit or on your board.

I use the woo and the garmin vivioactive 4 and it works great for me!

dachopper
WA, 1633 posts
2 May 2022 9:40PM
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So I take it - yes is the answer..... to a jumpt height calculated by the watch, on the watch?

neldy
QLD, 36 posts
3 May 2022 12:35PM
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Yes, there are apps that you can get that will only run on your watch that can show your jump height. Speaking from the Garmin ecosphere, and there are several (paid) apps you can get that show you how high you are jumping.

If you want to interrogate these apps more, you can see the results here (or google garmin kite app): apps.garmin.com/en-US/search?q=kite&device=&deviceLimit=&appType=&sort=&start=0&count=30

It's been over 12 months since I explored native watch apps, this one looks new, might give it a go and see how it performs: www.007software.eu/apps/kite-trackers-page/


The best solutions so far that i have used are easily the Woo + Garmin or the surfr.app which requires you use a phone on your body or board which can connect to your watch to display how high you jump.

dachopper
WA, 1633 posts
3 May 2022 1:13PM
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How accurate have you found the watch versions, verses the mounted devices?

I see that in most testing the mounted devices don't agree with each other, and even different generations of the same devices, the jumps get higher with each generation, so I am dubious as to how accurate they actually are.

weebitbreezy
557 posts
3 May 2022 5:37PM
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I thought that Xensr did an apple watch software app a few years back that used the sensors within the watch much like surfr uses the sensors in your phone.

Its probably this as the company died a few years back: apps.apple.com/us/app/sessions-surfsports/id1220676251?platform=appleWatch

At the time I remember them claiming it was a similar level of accuracy as the one on the board though they did say you could 'cheat' it by waving your arm around at the top of the jump.

The surfr guys reckon that running the phone inside the drybag in your wetsuit was pretty much as accurate as running it on the board (though you couldn't do the thing where you lift your legs up to get extra height in a jump). They had a setting to make it shout out the height after a jump or to make it vibrate once per metre of height I think so you didn't need to be able to look at it.

I like my garmin app that pairs to a woo best. But you need a woo on your board.

dachopper
WA, 1633 posts
3 May 2022 10:04PM
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Is anyone on here savvy with respect to manipulating 3 axis magnetometer raw data?

neldy
QLD, 36 posts
5 May 2022 3:44PM
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Select to expand quote
dachopper said..
How accurate have you found the watch versions, verses the mounted devices?

I see that in most testing the mounted devices don't agree with each other, and even different generations of the same devices, the jumps get higher with each generation, so I am dubious as to how accurate they actually are.


Last I tried, I found them lacking. May be worth trying again.

dachopper
WA, 1633 posts
5 May 2022 8:16PM
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Select to expand quote
neldy said..

dachopper said..
How accurate have you found the watch versions, verses the mounted devices?

I see that in most testing the mounted devices don't agree with each other, and even different generations of the same devices, the jumps get higher with each generation, so I am dubious as to how accurate they actually are.



Last I tried, I found them lacking. May be worth trying again.


I've done a load of testing on the raw sensor outputs on the watch like GPS and Barometric altitude, and they are both definately not useable. I'm going to try and write some code, that I think will give some accurate readings.... might have a beta within a few weeks to try.

neldy
QLD, 36 posts
Wednesday , 11 May 2022 9:30AM
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Select to expand quote
dachopper said..
How accurate have you found the watch versions, verses the mounted devices?

I see that in most testing the mounted devices don't agree with each other, and even different generations of the same devices, the jumps get higher with each generation, so I am dubious as to how accurate they actually are.



I tried the app i mentioned in an above post the other day.

It's not usable on the water. Even off the water it's not that great. Below is the Elevation changes tracked by the app. There were a few jumps, but its hard to figure out when they were and how high they were.



GPS, speed, direction etc all seemed to work fine. But that wasn't really what I was looking for.

dachopper
WA, 1633 posts
Wednesday , 11 May 2022 10:09PM
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Neldy...... I'm on the job.

I had a suspicion a lot of those apps were just using the GPS or baro sensors - both of which are completely unusable.
Baro has so much time lag that by the time you land the sensor is only just starting to record that you jumped.
GPS accuracy is to 10's of meters normally... you can see in your plot the sea level changed from 15 meters, to 10 then up to 30 meters,
That is typical of the standard watch GPS and Baro sensor combination, and the GPS only updates once a second on top of that.

I've got some testing to do on Friday against a Woo to finalize / confirm that my maths works, but I am pretty confident of a 100 fold improvement over the graphs you are looking at. My app won't record your elevation, it will only record the detected jump metrics, which should give jump height on your watch a couple seconds after you land amongst other things.... or it could store you highest jump, or give other data as users request.

All going well I may be able to pump out a beta app in a week or two.
Only drawback if you have an older watch, is that it must have an inbuilt accelerometer.

LePhasme
WA, 22 posts
Thursday , 12 May 2022 1:29PM
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On what kind of watch will it be available ? Android wear os ? garmin ? ios ?

neldy
QLD, 36 posts
Thursday , 12 May 2022 11:17PM
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Select to expand quote
dachopper said..
Neldy...... I'm on the job.

I had a suspicion a lot of those apps were just using the GPS or baro sensors - both of which are completely unusable.
Baro has so much time lag that by the time you land the sensor is only just starting to record that you jumped.
GPS accuracy is to 10's of meters normally... you can see in your plot the sea level changed from 15 meters, to 10 then up to 30 meters,
That is typical of the standard watch GPS and Baro sensor combination, and the GPS only updates once a second on top of that.

I've got some testing to do on Friday against a Woo to finalize / confirm that my maths works, but I am pretty confident of a 100 fold improvement over the graphs you are looking at. My app won't record your elevation, it will only record the detected jump metrics, which should give jump height on your watch a couple seconds after you land amongst other things.... or it could store you highest jump, or give other data as users request.

All going well I may be able to pump out a beta app in a week or two.
Only drawback if you have an older watch, is that it must have an inbuilt accelerometer.


Very cool! If you would like a tester, i'd be happy to help provide feedback.

May the best algorithm win.

vodka
146 posts
Friday , 13 May 2022 7:00AM
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www.xctracer.com/en/76/?oid=1905&lang=en

instant baro readings



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"Kitesurf Jump height measurements......... on your smartwatch?" started by dachopper