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Old 04-28-2013, 12:31 PM   #11 (permalink)
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I've used garmin connect for my tracking, both using cell phone tracking apps, and a proper GPS watch. GPS on it's own is able to determine your elevation (remember it's triangulating or multi-angulating off satellites, so it measures how far you are away from each satellite, and calculates where the spheres line up).

Nevertheless, garmins website corrects for elevation using USGS data (as far as I know)... So it SHOULD be calculating for actual speed on the slope, not just horizontal speed.

That said, and I've said it before: Phone GPSs suck. STOP COMPARING TOP SPEEDS! In my experience, phones seem to vastly over estimate the top speed for the day, and it's wildly inaccurate. I experienced 10-20 km/h swings in top speed from day to day.

After switching to a GPS watch, my speeds dropped to a more reasonable level, and the difference between days on the same hill dropped to about 5 km/h (which seems reasonable to me).

GPS phones are great ways of tracking total distance, and number of runs for the day, as well as showing your buddies the route you took if you split up. But I think they're useless for comparing top speed...

http://www.gpstrailblazer.com/skydiving/

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Old 04-28-2013, 12:36 PM   #12 (permalink)
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Quote:
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If your going 100mph down a 45 degree slope it would track around 50mph unless something is adjusting for the slope/angle of approach.
No, it would track at ~70mph.
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Old 04-28-2013, 12:37 PM   #13 (permalink)
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Quote:
Originally Posted by poutanen View Post
I've used garmin connect for my tracking, both using cell phone tracking apps, and a proper GPS watch. GPS on it's own is able to determine your elevation (remember it's triangulating or multi-angulating off satellites, so it measures how far you are away from each satellite, and calculates where the spheres line up).

Nevertheless, garmins website corrects for elevation using USGS data (as far as I know)... So it SHOULD be calculating for actual speed on the slope, not just horizontal speed.

That said, and I've said it before: Phone GPSs suck. STOP COMPARING TOP SPEEDS! In my experience, phones seem to vastly over estimate the top speed for the day, and it's wildly inaccurate. I experienced 10-20 km/h swings in top speed from day to day.

After switching to a GPS watch, my speeds dropped to a more reasonable level, and the difference between days on the same hill dropped to about 5 km/h (which seems reasonable to me).

GPS phones are great ways of tracking total distance, and number of runs for the day, as well as showing your buddies the route you took if you split up. But I think they're useless for comparing top speed...
Figured out your problem. Try using MPH...
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Old 04-28-2013, 12:47 PM   #14 (permalink)
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Figured out your problem. Try using MPH...
Ah the states, some of the most advanced technology in the world, but the general population hasn't caught up yet!

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Old 04-28-2013, 12:57 PM   #15 (permalink)
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Ah the states, some of the most advanced technology in the world, but the general population hasn't caught up yet!

Innovation is oft mocked by the unintrepid.
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Old 04-28-2013, 01:23 PM   #16 (permalink)
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No, it would track at ~70mph.
It was a plain, dumbed down example. We aren't exactly comparing math and geometry skills in this forum.
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Old 04-28-2013, 01:28 PM   #17 (permalink)
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Ah the states, some of the most advanced technology in the world, but the general population hasn't caught up yet!


I like metric. I wish everyone here used it. Working in medicine that's almost all I use throughout the day. I just wish the speed limits in Canada And other 3rd world countries were higher than 80-100 km/h. Fucking granny driving everywhere. I'm surprised I didn't get any tickets while driving around up here. I was doing like 140-150 everywhere. Makes me feel like I'm really hauling ass though.
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Old 04-28-2013, 02:21 PM   #18 (permalink)
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I like metric. I wish everyone here used it. Working in medicine that's almost all I use throughout the day. I just wish the speed limits in Canada And other 3rd world countries were higher than 80-100 km/h. Fucking granny driving everywhere. I'm surprised I didn't get any tickets while driving around up here. I was doing like 140-150 everywhere. Makes me feel like I'm really hauling ass though.
2 lane highways are usually 100 km/h in AB, and highways are 110 outside of the cities! I usually cruise at 125 without an issue...

I too wish we'd all adopt metric completely. I use metric when I'm woodworking now. It's a lot easier/faster multiplying and dividing whole numbers than it is fractions! Less errors means I do a better job.

In the type of construction I'm in, it's all metric. Tonnes, cubic meters, centimetres of concrete, millimetres of tolerance on the concrete finish.
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Old 04-28-2013, 05:11 PM   #19 (permalink)
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40 years old, second year after a 11 year hiatus. Was out about 30 times this year and hit 79 straightlining down a nice chute in powder. That was fun.
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Old 04-28-2013, 05:31 PM   #20 (permalink)
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This used to be the case but it really is not so much any more. As an instrument rated pilot, I use GPS for instrument approaches. Few years back, a GPS approach was considered a non precision approach because the system did not calculate vertical height and motion well. The average GPS approach had minimums that were on par with an NDB approach ( the least accurate ).

This is no longer the case as both the processing power of GPS units and the improvement in the satellite coverage has increased. A GPS unit, even a handheld or cell phone, has much greater accuracy and the panel mounted units are near perfect. Now with ground based WAAS (wide area augmentation system) these units now allow a precision glide slope approach.

As a result of aviation driven accuracy, all GPS units including cell phones have seen a huge improvement in accuracy and this includes major corrections to this vertical speed error. Today, your small handheld units are highly accurate and the deviations small.

There still exists some potential for error however and that is dependent upon direction of travel and your location on the plant. The GPS satellite constelation is in geosynchronous orbit around the equator. The farther north you are in the northern hemisphere, the lower the azimuth is of the signal and this makes it a little tougher for the unit to calculate vertical height than near the equator. Terrain will also cause more signal degradation. If you are at a high northern latitude in say the PNW on a north facing slope, you loose some coverage from some of the satellites due to geographical interference. It's the same reason your XM radio will cut out in the mountains or in heavy timber. This lapse of coverage intermittently will create errors in the unit and throw your speeds off. Ride a south facing slope in the northern hemisphere and you're golden.

Isn't your pilot stuff a bad example though? I didn't get into the math because I'm averse to it...but with the exception of like fighter pilots.....doesn't most piloting involve pretty low angles? I mean what is the angle of landing approach?

Just axin.
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