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SFB Speed King Event
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LoveSplittingLanes



Joined: 17 Jul 2004
Posts: 97
Location: Back in CA!

PostPosted: Thu Sep 25, 2014 6:16 pm    Post subject: Reply with quote

Thanks Tramontana00. Tides look OK for Haskins this week end. Hoping for wind now... Hopefully we won't terrorize any free stylers zipping by in our speedos Laughing

btw, please clarify what the GPS Speedo Speedsurfing Geek rules : All files need to be uploaded directly and calculated/ corrected by the web site or OK to enter the data manually?

Asking since my GPS showed a 33.83 knots (max 2sec) on the display while "corrected" to 33.49 kt (max 2sec) on the web site once the file was uploaded... Would the variance mean that the GPS accuracy allow for a slight adjustment as the file is being "reviewed"? Tech geeks, please chime in (in your speedos, no photos please)
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SpeedRoo



Joined: 27 Sep 2006
Posts: 86

PostPosted: Thu Sep 25, 2014 8:13 pm    Post subject: Reply with quote

Your GPS display shows the maximum speed while the software calculates the maximum 2 second speed, hence the slightly lower number.

KA72.com is a great site to upload your files and have them calculated, as well as showing them on a Google map page.

The GPS is pretty accurate, I pioneered the system back in 2006 and did the development work to bring Doppler speed measurement to speedsailing.

Roo
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tramontana00



Joined: 15 Feb 2010
Posts: 204

PostPosted: Thu Sep 25, 2014 9:08 pm    Post subject: Reply with quote

In my experience GPSResults software is the best and easiest way to analyze data and upload files to GPS-Speedsurfing.com web site.
KA72 works good and it is for free but missing 500m discipline. It works perfect for posting on GPS Team Challenge web site. It also gives slightly higher 1 hour average speed in case of falling of the plane here and there. This is because GPSResults doesn't calculate any time spent at speeds below 5 knots.
So, to elaborate some more on 2 sec. max speed vs. max display speed (1 sec.), it makes no difference if you post it manually or use software, the numbers will be the same for 2 sec. max speed.

Speedos forever!
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SpeedRoo



Joined: 27 Sep 2006
Posts: 86

PostPosted: Thu Sep 25, 2014 10:15 pm    Post subject: Reply with quote

Boris you may want to check your settings in GPSResults. Sounds as if you have the minimum speed filter set at 5 knots, you can set it at 0 if you want so it calculates the true distance you covered.

To understand the difference between the max display on the gps screen and the calculated 2 sec max you need to realise the gps calculates an instantaneous speed reading from the doppler data that measures the change in frequency as the gps receiver moves away from the signal source. The software on your computer takes 3 of these instantaneous readings that occur at 1 second intervals one after the other; it then averages the 3 readings to create the max 2 sec speed. All while wearing speedos!
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tramontana00



Joined: 15 Feb 2010
Posts: 204

PostPosted: Fri Sep 26, 2014 1:11 am    Post subject: Reply with quote

Yes, it's on 5 knots and yes it can be set on 0 but it always goes back to 5 knots as a default setting. So, to get it to calculate true distance it needs to be reset to 0 every time. Unless there is a way to make 0 knots as a default setting???
I figure it's the best to keep it at default settings. Most likely everyone does, so that makes it even game.
Best way around this little problem is to stay on a plane 100% of the time when attempting 1 hour average speed Wink
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purplegopher



Joined: 27 Apr 2007
Posts: 17

PostPosted: Sat Oct 11, 2014 12:11 am    Post subject: Any of the Bay Area guys interested in hitting Pyramid Tues Reply with quote

http://forecast.weather.gov/MapClick.php?w0=t&w1=td&w2=wc&w3=sfcwind&w3u=1&w4=sky&w5=pop&w6=rh&w7=rain&w8=thunder&w9=snow&w10=fzg&w11=sleet&AheadHour=0&FcstType=graphical&textField1=39.91945&textField2=-119.51937&site=all&unit=0&dd=&bw=&AheadDay.x=56&AheadDay.y=1&AheadDay=48
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tramontana00



Joined: 15 Feb 2010
Posts: 204

PostPosted: Sat Oct 11, 2014 3:58 am    Post subject: Re: Any of the Bay Area guys interested in hitting Pyramid Tues Reply with quote

purplegopher wrote:
http://forecast.weather.gov/MapClick.php?w0=t&w1=td&w2=wc&w3=sfcwind&w3u=1&w4=sky&w5=pop&w6=rh&w7=rain&w8=thunder&w9=snow&w10=fzg&w11=sleet&AheadHour=0&FcstType=graphical&textField1=39.91945&textField2=-119.51937&site=all&unit=0&dd=&bw=&AheadDay.x=56&AheadDay.y=1&AheadDay=48

42% cloud cover, maybe not the best sign for a clean wind. It could be gusty and swirly but direction looks good, plenty of wind and warm enough for speedos...are you on a mission? I'll be there.
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purplegopher



Joined: 27 Apr 2007
Posts: 17

PostPosted: Sat Oct 11, 2014 9:38 am    Post subject: Reply with quote

Watching the wind and figuring out transportation. If predictions for 40 hold, I'll be there. The face of the moon your direction should be good for 40 knots.
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KevinDo



Joined: 02 Jul 2012
Posts: 426
Location: Cabrillo Inside

PostPosted: Sun Oct 12, 2014 12:42 am    Post subject: Reply with quote

Hot damn that forecast looks good!! If only I could get out there. ..
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tramontana00



Joined: 15 Feb 2010
Posts: 204

PostPosted: Sun Oct 12, 2014 3:38 am    Post subject: Reply with quote

Pyramid Lake wind predictions are still holding with noaa and windfinder showing gusts over 35kt and windalert now showing a bit less, around 30kt gusts:

http://forecast.weather.gov/MapClick.php?w0=t&w1=td&w2=wc&w3=sfcwind&w3u=1&w4=sky&w5=pop&w6=rh&w7=rain&w8=thunder&w9=snow&w10=fzg&w11=sleet&AheadHour=0&FcstType=graphical&textField1=39.92027&textField2=-119.55185&site=all&unit=0&dd=&bw=&AheadDay.x=57&AheadDay.y=15

http://www.windfinder.com/forecast/sutcliffe_pyramid_lake

http://windalert.com/spot/98604#forecast

Today I had SUP session at Wino and Tamarck beach.
Wino beach speed strip shore line is now about 300+ meters long and very straight. Shallow water, about one foot deep, extends for about 30 yards from the shore and than it drops to knee deep, good enough for fins up to 36cm or so. Smooth sand bottom, no rocks, looking as good as I've seen it in last few years due to lower water level and recent storm with onshore winds leveling the place.

Tamarack beach looking too shallow and some exposed rocks, not as good as Wino beach.

Some tips:
Goggles are mandatory. Blowing sand in rigging area.
50' of rope is a great idea if you are rigging more than one sail. You can tie it down to the car wheel or a rock, otherwise it will blow away. There is no place to hide here. It is Moon like environment.
Food and drinks for a day is also good idea. First place to buy anything is 15 minutes drive from the beach.
Speedos are optional but helpful. No need to look like an odd duck.
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