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ShadowBoxLive GPS Tracker / Pro Ski Coach Water Ski Forum
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#1 Fri, Jan 29, 2010 9:12 AM

t8skier
Karma:   
Regular
From: Arlington, Tn
Registered: Sun, Jun 21, 2009
Posts: 32
Skis At: Collierville Ski Club, Tn
Foot Forward: Right

ShadowBoxLive GPS Tracker

Has anyone tried this device.  I have tried to email them with more information with no response.  I think it would be a great tool if it was accurate tracking and a coarse could be overlayed.
Most affrordable GPS are only accutate to about 9 feet.  Not muck help for a slalom coarse.
Any thoughts?
http://www.shadowboxlive.com/

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#2 Fri, Jan 29, 2010 9:22 AM

WadeWilliams
Karma:   15 
Pro Skier
From: Lynn, MA
Registered: Tue, May 15, 2007
Posts: 1087
Skis At: Not short enough
Foot Forward: Right
Website

Re: ShadowBoxLive GPS Tracker

Ya, it's a pretty cool concept! I had a nice chat with the engineer who has spent the last 2 years developing the device. It's designed for kiteboarding or wakeboarding and other aeral sports, with multiple accelerometers and GPS units. As I recall, The GPS units are 1hz, i.e., 1 ping to the sattelites per second. The accelerometers are primarily used for determining number of rotaions (for spin and flip tricks) and it does do some very cool stuff for tracking your path on a wakeboard or kiteboard.

As far as waterskiing goes, I can't say that I've had an opportunity to try it. I do know that from speaking with the engineer at length, it's not exactly designed or optimized for the speeds we're achieving through the slalom course. I do not believe that it will show a completely accurate path (it may show your track inside the buoy, instead of outside) and with only 1 ping to the sattelite per second, (or two, if you count both gpses) you're only looking at 30-40 tracking points over the length of the course. That's 6 or maybe 7 points per buoy.

Is it cool? Absolutely. Will it give you some information on what you're line looks like from overhead? Yes. Is it exactly what we're looking for as skiers? Probably not. Is it worth the $$? If you have wakeboarders who would use it to, absolutely.

\/\/

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#3 Fri, Jan 29, 2010 11:14 AM

t8skier
Karma:   
Regular
From: Arlington, Tn
Registered: Sun, Jun 21, 2009
Posts: 32
Skis At: Collierville Ski Club, Tn
Foot Forward: Right

Re: ShadowBoxLive GPS Tracker

Is there anything out there that would track a skiers path with the accuracy we need?  Maybe a transmitter on the skier and reciever in the boat.

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#4 Fri, Jan 29, 2010 11:37 AM

WadeWilliams
Karma:   15 
Pro Skier
From: Lynn, MA
Registered: Tue, May 15, 2007
Posts: 1087
Skis At: Not short enough
Foot Forward: Right
Website

Re: ShadowBoxLive GPS Tracker

There's no out-of-the-box solution yet. The shadowbox is the closest thing yet. I have some other technology I'm working on that should be more precise...

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#5 Fri, Jan 29, 2010 11:58 AM

t8skier
Karma:   
Regular
From: Arlington, Tn
Registered: Sun, Jun 21, 2009
Posts: 32
Skis At: Collierville Ski Club, Tn
Foot Forward: Right

Re: ShadowBoxLive GPS Tracker

I hope you will post something when you get it developed!

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#6 Fri, Jan 29, 2010 12:05 PM

WadeWilliams
Karma:   15 
Pro Skier
From: Lynn, MA
Registered: Tue, May 15, 2007
Posts: 1087
Skis At: Not short enough
Foot Forward: Right
Website

Re: ShadowBoxLive GPS Tracker

Clearly.

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#7 Sat, Jan 30, 2010 1:37 PM

miski
Karma:   
Slalom Mentor
From: Saline, MI
Registered: Wed, May 21, 2008
Posts: 114
Skis At: Jepawhit, Lyons, SkiTec
Foot Forward: Left

Re: ShadowBoxLive GPS Tracker

Hey - I looked at this and wouldn't write it off because of slower GPS update rates. Basically the 3 axis accelerometers combined with the 3 gyros (rotational rate) make up a complete inertial measurement system (IMU). These are sampled much higher than 1/sec (probably .5-1khz) and provide a full 3-d path w/ all angles. The problem with accel based IMU, is that integrating accels twice to get displacement and thus path has limited accuracy due to cumulative integration error - that is where the GPS hit every second comes in - they use the GPS coordinates to remove the error and correct the path. If these ever go on sale, I would consider pitching in with a few others to buy one and try it out.

http://en.wikipedia.org/wiki/Kalman_filter

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#8 Fri, Jul 16, 2010 1:21 PM

Ripxx
Karma:   
Rookie
Registered: Fri, Jul 16, 2010
Posts: 1

Re: ShadowBoxLive GPS Tracker

Hey you guys should check out Ripxx. It is about the size of a palm, Ripxx is shaped for users’ hands and it can also be easily strapped to the leg or waist. Ripxx features a GPS tracker which can send 10 tracking signals every second during users’ training, e.g. running or skiing. Besides, the device also has three built in accelerometers and three gyroscopes. With these sensors, users can continually record their practice data such as position, acceleration, speed, vertical drop, rolls, spins, turn, orientation and altitude. The data will thence be transferred into a computer via a USB
cable for translating into various forms of analysis, e.g. charts, 3D models, graphs, etc. Analysts also can plot or overlay the users’ movements onto a map to retrace their route and location. This will help for instance mountain bikers to analyze their weaknesses in certain tracks.

Below is a summary of what Ripxx can measure:

    * Elapsed time of run
    * Time of day run was made
    * Run distance
    * Top speed as well as average speed.
    * Top acceleration and average acceleration
    * Distance, height and air time on jumps
    * Roll rate (how quickly you execute spins)
    * Roll count (how many times you execute a roll)
    * Vertical drop from any two points
    * Steepest part of run
    * Number of runs on the same track
    * Number of tracks at the same location

http://stores.ripxxstore.com/catalog/Device.jpg
http://ripxx.com/images/snow-better-lines-main.jpg
http://ripxx.com/images/snow-3d-replay-main.jpg

Check out the Website at www.ripxx.com

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#9 Fri, Jul 16, 2010 4:21 PM

h20dawg79
Karma:   10 
Water Ski Sage
From: nashville,tn.
Registered: Fri, Oct 17, 2008
Posts: 562
Skis At: Old Hickory Lake, TN.
Foot Forward: left

Re: ShadowBoxLive GPS Tracker

Sounds like it Could be a great feed back tool. Now, we just need some Water skiers to actually use it and help to refine it's capabilities and since all Slalom courses are the same, set up some Baselines for various speeds and line lengths...


"Warning" -the Surgeon General has determined; That the preceding statements accurately reflect the views and opinions consistent with "DSS" (Delusional Slalomitis Syndrome) a highly contagious life altering condition... (Handle with Extreme care & Patience)

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