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Messages - LaPerouseBay

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1
South shore is nice. 
PB will be along with more details.   :)

https://youtu.be/3oHDIHtLRCw

2
Random / Re: Surfing Quotes
« on: April 16, 2021, 08:07:42 PM »
The Lance Armstrong quote is just weird ??? That guy doesn't surf.

Something tells me you've never seen him surf. I haven't either, but what else has he got?.


Lance can surf.  He's a damn good paddler too.  He's fearless on the north shore.  He loves Maui. 

What's he got?  Oh yeah, the social pariah thing.  That's old news.  He was a dick.  He agrees and has been talking about it for years.  He's not proud of his behavior and has moved on.  He was a star at 18.  Some wealthy backers saw the potential, groomed him and turned him into a - well - you know the story.   

The cliffnotes version is that pro cycling was - and remains - a black sport.  Lance Inc. got a belly full and fought back.  They had a plan, financed it and it worked.  He kicked their teeth in for years, got rich, banged countless broads and flamed out spectacularly.  He's fine now.  He hit it big in the market and got his generational wealth back. Big family, fit, articulate and wise beyond his 49 years.  He's had one hell of a life.

Check out his podcast interview with Charles Barkley.  They chat a bit of how they deal with the people that turned on them when they were down.  Sir Charles, he's a straight shooter.  So is Lance.  Astonishing athlete.         

3
Foil SUP / Re: One problem with forums...
« on: April 08, 2021, 01:11:17 PM »
The size and heave of those swells as displayed by the drone footage is a total different animal.  Picture a 20,000 foot mountain rising from the bottom of the sea floor.  Swells traveling unfetched, 1000's of miles.

I tried to downwind in Connecticut in 50 mph winds and could only fly on my big slow Maliko M200 wing.  Think 8 miles of fetch in 25 feet of water.  No comparison.

Here is the windiest day we have had so far this year.  Solid 35mph gusting to 50, slightly offshore. 

I escorted a relatively new outrigger paddler.  Strong guy, he windsurfs 60 foot faces at Jaws.  Super fun day.  I kept us in 100 feet of water, barely skirting the reef, which drops to 25 pretty quickly.  If you look left at the last part of this video you can see the east rollers moving thru the 'shallow' water. 

1 outrigger from our group was in there, very strong, very experienced.  He said it was an all time top 5 scary Maliko for him.  These are the days we really don't want anything to go wrong. 

We had so much fun.  Solid 12 foot east swell - zero north swell to cross it up.  Next day the wind was less offshore, almost as strong.  So fun.

https://youtu.be/JOVhfv-1hPk

Here is the bathymetry of Spartan reef, overlayed into Google Earth.  Pins are at start and finish of video.  It gets very knarly on that reef on big days.  That's why I started tracking this data many years ago.  Those numbers are fathoms.   

4
Random / Re: YouTube Video GOES Viral - Why?
« on: February 12, 2021, 02:49:32 PM »
Wow that's a trip!
I'd love to know HOW this happened, lot's of people wondering and speculating the same in the yt comments...

Grey covered this a few years ago, things are constantly evolving, but this is the general idea.     
 
https://youtu.be/KW0eUrUiyxo

Destin did some interesting videos about a year ago...

https://youtu.be/1PGm8LslEb4

The content belongs to big movie studio, no way to monetize directly.   Figure out how to replicate and have hundreds of videos with millions of views, that's my understanding of how to make substantial income from views. 

Derek - another favorite - about a year ago.  Successful content producers in educational/science based channels seem to work really hard and pay for help.  Smart guys,  getting rich the old fashioned way - with a real product...  Amazing history/poli sci channels coming up as well...       

https://youtu.be/fHsa9DqmId8

   

5
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 31, 2021, 12:12:04 AM »
No one catches big waves in 2 seconds.
-snip-
Unless there is an air-drop.

Well, I guess that settles that.

----------------------------------------------------------------------------------------------------------------------------
-snip-
The Apple Watch uses an interval that "varies." The definition of that is proprietary, but from what I've seen online (and anecdotally validated through using it) is that the the Apple Watch is taking a fix roughly every ten seconds then using an accelerometer to interpolate position.
-snip-
----------------------------------------------------------------------------------------------------------------------------
On the one hand I should be happy someone even wants to pay attention to this.  On the other hand the responses are anecdotal.

I Googled  "iWatch GPS sample rate" and that's all I could find.  The thread inferred that GPS has serious limitations among wristwatches.  GPS is what it is, and it ain't much for accurate speed on the water.  That's common wisdom on the web.  GPS eats batteries, that's common wisdom too.  Hence the low sample rate... 

This is probably The Fastest longest wave ever recorded. 

That's quite a claim. 

-snip-
The only comparable waves to Mavericks (Half Moon Bay) are Jaws and Nazarre
-snip-
PS: Maybe Skeleton Bay?

There are several spots in the islands that hold giant surf.  Undoubtedly several more around the globe.           

Glad your iWatch is working for you and your pals.  Been fun, I'm out.

6
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 28, 2021, 07:37:29 PM »
Another example of a standard wave (2nd view).  The Blue Charts show the MAXIMUM and MINIMUM for every SECOND.  A Flatline would have dropped out of the the view. 

Here is some more bad news about those data points from an iWatch.  From this page.  https://www.letsrun.com/forum/flat_read.php?thread=9954519

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I just bought an Apple Watch 5 and returned it. Here's what I found:

- Most watches on the market use 1-second GPS fix intervals

- The Apple Watch uses an interval that "varies." The definition of that is proprietary, but from what I've seen online (and anecdotally validated through using it) is that the the Apple Watch is taking a fix roughly every ten seconds then using an accelerometer to interpolate position. Apple has a high-res screen (big battery drain), so the reduced GPS fixes conserve battery life.

- The Apple Watch uses a generous GPS smoothing function. This makes really pretty lines on a map, but it isn't very responsive to pace changes, especially when combined with the increased GPS fix intervals.
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I was skeptical about that itty bitty battery - (and antenna).  As the forum guys explained, it's all a matter of compromise.  iWatches are amazing at what they do. 

But certainly not good enough for zero to 34mph in a second or two.  No way Jose'.

PB's post piqued my interest, so I had a look around.

Location measurement via GPS without doppler is inherently inaccurate, both because of DOP issues (HDOP, PDOP, GDOP) and atmospheric issues. Fortunately, the feds turned off the time signal randomizers in 2000, so it's no longer wildly inaccurate, but it's still about +/- 5 meters. Increased sampling can help, but that doesn't change the simple fact that every measurement can be off by as much as +/-5 meters, and the distribution is somewhat random. You can be standing still and the GPS thinks you just jumped 10 meters in some fraction of a second. Raw GNSS data can be manipulated to give an accuracy of about +/- 1 meter. I don't know if GoPros, iWatches, Trace or any of the stuff you guys are using does that, but that's still a fairly shitty ruler.

Atmospheric conditions, line of sight, it's all in the Navigation engineering sites.  Consumer grade GPS for acceleration/speed/location is lame until you get into very specific, very expensive software.  That's how the DoD does it...  Big antennas, big power, double checking data.   

7
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 28, 2021, 01:02:27 PM »

Ahhhh now I get it you are demostrating crappy technology.  Here is an example of Data extracted from TRACE.  It was my standard for 5 years. 

TRACE NO FLATLINES EVER!  I know because I downloaded the data.  30,000 records per session 

Another example of a standard wave (2nd view).  The Blue Charts show the MAXIMUM and MINIMUM for every SECOND.  A Flatline would have dropped out of the the view. 

Having recorded and downloaded 5 million data points the TRACE never glitched.

That's hilarious.  Now I know you are messing with me. 

Here is a graph using a program even older than either your iWatch/Trace, (at 5Hz) and the iWatch/Waterspeed (at "~1Hz.")  This is Garmin's old "Training Center."  I prefer it to the newer Garmin graphing, which is dumbed down for the social media market.  All the new consumer grade stuff is.  They gotta follow the market.   

From that video I linked above: I'm zooming along, then stop to wait to meet up with a fellow paddler.  I'm just sitting there, floating along.  At 18Hz.   See all the dropped signals?  Smoothed even more in the second pic...  If you want to put your faith in that little iWatch at 1Hz, air dropping, have at it.  I'm not buying all those bar graphs.  That data is smoothed.  That's a whole lot of 1's and 0's in your little bars...

GPS on the water is pretty rough to begin with.  1Hz is weak sauce, even if you hi tech watch isn't dropping the occasional signal... 5 million points and you never had a glitch?  Dig deeper. 

8
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 27, 2021, 01:51:05 PM »
Here is a link to the impeller, with a few comments about the limitations of GPS. 
https://www.rowinginmotion.com/designing-measurement-system-rowing-boat-speed/

Here's Robby on a few videos I referenced.

Average speed is over 18mph.   
https://youtu.be/M4LQqMhdg5E

Gopro on his head, with the speed overlay (GPS at 18Hz).  Gopro cams have the gauge in their software somewhere.  It will be far more accurate than an iWatch and Waterspeed app, recording "~1Hz"  Particularly for air drops.  Spikes like an air drop are when I get very skeptical.  Hence the running graph.  I've seen some weird stuff on my 1Hz running graphs.   
https://youtu.be/0fqaT7LOCvY?t=193

9
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 26, 2021, 04:17:15 PM »
Beasho,

Here is the full video.  In my sport, we aim to flatten that speed line.  We avoid dropping straight down the waves, unless we can "make the next section" (to use surfing parlance).  That's why I whipped up that graph in Racerender.  If the speed graph drops precipitously, I'm about to do something wrong....   

In surfing, a scrolling speed graph will help illustrate the accelerations as you turn down the line.

That said, it's important to realize that all those fancy numbers are relative to the ground, not the surface of the water...  The effect of angling across a wave would be easy to see.  You should do it on your foil at Mavs.  I'll send you the template for that graph, it's easy to adjust for your speeds. 

That long ride Robby did averaged 18mph.  He was flying across the wave, just as Laird does on foil at Nazare'.  Nothing against air dropping, then straightlining big Mavs, it's all amazing to everyone. 

If you really want to claim speed across the water (or air) using GPS - accurately, you gotta go mechanical.  Rowers have been using them forever.   

https://youtu.be/B_FlTgM_Xw4

10
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 26, 2021, 03:42:48 PM »
Garbage in, garbage out.  Telemetry scrolled real time (like a scope on a hospital heart rate monitor) will show you the error of your ways.  Flatlines at 18Hz is one thing, at "~1Hz" would give new meaning to the concept of  "data smoothing." 

Here is an example of a real time speed graph, overlayed on video.  It scrolls thru 10 seconds of telemetry (synched automatically on the video file, via gopro).  Your gopro Max will do a speedometer overlay with the same data.  (That's what Robby Naish used on his wingfoil speed at Maliko video).  Both cams sample at 18Hz.

See all the missing points on the line?  That's 180 points on that line, IF none are missing. Flatlines are missing points.  It's very common among GPS telemetry.  (That's why the DJI pros go up to 100Hz).   

Your iWatch is struggling to send 10 points to the Waterspeed app.  Then the app averages it all.     

The iWatch antenna is mounted to a moving object (wristwatch), Gopro antenna is mounted to my head.  We have excellent GPS signals here, as do you.  The helicopter guys have a nifty site to prove it.   https://www.uavforecast.com/

So, those air drops Haley is doing may very well be 34mph.  But the data points you are using are weak at that rate of change.  Therefore, top speeds spewed by the Waterspeed app are wildly speculative.  You know it better than I do with your math background.

When you put all the data alongside the video, it's easy to see.       

11
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 26, 2021, 10:52:50 AM »
Then someone puts peanut butter in the chocolate.  We don't even know who.  Maybe it was this guy????
Ken Winner (not him in your picture).

The Waterspeed app allows for CSV downloads but at ~ 1 record per second.

Garbage in, garbage out.  Telemetry scrolled real time (like a scope on a hospital heart rate monitor) will show you the error of your ways.  Flatlines at 18Hz is one thing, at "~1Hz" would give new meaning to the concept of  "data smoothing." 

You live a stone's throw from Silicon Valley, Ivy league math background, yet continue to use the weakest telemetry/software available.  Shame on you.   :)   


12
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 24, 2021, 10:32:29 AM »
For those new to the surf data game let me put this in context.
TRACE was recording @ 5 Hz where the iWatch is typically 1 Hz.   

Your Gopro records GPS at 18Hz.  Overlay the telemetry on video (with a real time running speed graph).  Trust me,  you will gain a new perspective on peak speed.
     

   

13
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 24, 2021, 07:18:10 AM »
This is probably The Fastest longest wave ever recorded.  at Half Moon Bay, on an iwatch...without a tow in...

Fixed it for you...

14
Gear Talk / Re: Apple iWatch with Dawn Patrol SURF TRACKING
« on: January 23, 2021, 08:59:44 PM »
This averaged 21 mph for 1/2 a mile. 

Robbie Naish surfed over a kilometer at over 18mph on an SUP.  Easy to find on the Google.  It was almost 7 years ago.

Laird and many other pros have likely gone longer and faster on foil than Haley's Mavs ride.

https://youtu.be/7fWhI3xeo1U

15
Random / Re: My action cam evolution
« on: January 07, 2021, 01:08:45 PM »
There are only so many places with truly good wind in the US and the World.  Cape Hatteras, The Gorge, San Francisco Bay Area, Corpus Christi, and Hawaii.

South Africa is king when it comes to big downwind. 

https://youtu.be/tv_3mxUAcnU

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