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Old 10-26-2010, 05:06 PM   #21 (permalink)
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Quote:
Originally Posted by Snowolf View Post
I am no GPS engineer, but I believe it is actually the reverse. I know that the FAA warns about GPS speeds on GPS instrument approaches that the pilot should only pay attention to indicated airspeed not GPS speed because in the decent, the aircraft is actually traveling faster than the GPS shows resulting in potential runway over run.I think in a climb, the speed reads faster than actual......

This also may be out of date for today anyway since they used to actually deliberately degrade accuracy (the D.O.D) for security reasons. It is my understanding that this is no longer the case and that vertical GPS measurement is now very accurate.
I think in both cases, GPS with poor vertical accuracy will probably assume that elevation did not change. So both decent and climb will estimate slower than actual speed. It really depends on the actual device software. But my bet is that in most situation, they will estimate slower than actual speed.

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Old 10-26-2010, 05:38 PM   #22 (permalink)
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Wolf, let's test it. I'm curious to see for myself. GPS vs Radar. When we get a base on Stadium you can be the crash test dummy. Were you using a dedicated GPS or an app on a GPS enabled phone?
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Old 10-26-2010, 06:47 PM   #23 (permalink)
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last year i hit 58mph on my gps. So according to above it might be a lil bit faster. Using a 158 Herr Vaughnster. It was pretty damn fast.
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Old 10-26-2010, 07:28 PM   #24 (permalink)
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I thought something like thtis would be cool, more accurate and cheap.
Amazon.com: Tech 4 O SI- Ski 1 Speedometer: Sports & Outdoors: Reviews, Prices & more

Apparently it doesn't work though at least not to the three reviews I read
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Old 10-29-2010, 11:23 PM   #25 (permalink)
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If you really want to know your speed you need these. Recon-Zeal transcend




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Old 10-30-2010, 12:02 AM   #26 (permalink)
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Those goggles are so incredibly badass, but if you're anything short of a pro, you're just going to look like a complete tool wearing them
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Old 10-30-2010, 11:48 AM   #27 (permalink)
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Shit dude, I could care less if I look like a tool wearing them.... That is if I could afford them in the first place
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Old 10-30-2010, 12:37 PM   #28 (permalink)
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LOL I think i'd look like a bigger tool pointing a speed gun at my buddy as he zooms on by... and i wouldn't even put that past me... so i dono about the goggle.. maybe ill wear a shirt that says "I'm Rich Bitch" in case anyone thought I was genuinely interested in how fast I was going

In all honestly though, I think i'm the only one not impressed with these goggles. Maybe version 2.0 next year
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Old 01-27-2012, 05:39 AM   #29 (permalink)
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Hate to bring up more dead threads, but I'm really curious and after searching a few different things I came up on this old post. Does anyone have any great app recommendations for iPhone for gps/ speed measuring?

Or would an old garmin gps be better off?

What are most of you out there using?
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Old 01-27-2012, 06:02 AM   #30 (permalink)
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I'm a math dyslexic with ADD, so this thread gives me a headache, but isn't this the way horizontal inaccuracy would work to log a speed slower than actual speed?


Hope so!!! Means my top speed of 35+ MPH was actually faster! (...I know, I know! ...but I'm a first season NooB. So that max speed impresses the F#%$ out of me! ) {...scared the F#%$ out of me too!!}

I jumped from 15-18 MPH max speeds with 9-11 Avg. speeds on my blue runs, to those 30+ MPH Max. speeds with avg. speeds of 21-23 MPH over the course of 2 weeks!
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