Under 18s

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ASRA AdminPermalink Reply by Bugs on March 18, 2009 at 20:20

I remember a few years ago there were two sorts of GPS systems - those that measured altitude and cheaper ones that didn't. Maybe they all have altitude monitors now? I'm a bit out of the loop with the modern technolomology.

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Premium MemberPermalink Reply by Jacko on March 18, 2009 at 20:37

if you can get a GPS on your phone then im pretty sure a propper sports GPS u get in the shops will have everything... the one i got was just like a watch, and it records everything... i can even take points and use them as a start line and a finish line then record the track i want to skate, then race my own times... it can even display a track that im running and show me my 'ghost rider' (best time) as a small black triangle and the 'current lap' (me riding) as a white triangle if i really wanted to get tech. Then i can pull that information off and upload it onto my computer and look at it as a graph and map it against like google maps or whatever map program it comes with and get accurate readings of where i was fast and where the altitude dropped or whatever... and that is the most basic of basic GPSs on the known market (pretty much)

but the main point was, you can never get an accurate reading of your speed by going off a car's speedo... you can get close but there will always be a 5-10k error depending on the speed your/the car is traveling. trust me i would know...

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Permalink Reply by dave k on March 18, 2009 at 22:14

Sector 9 made a downhill board with a built in speedo above the front truck in the 90s that used magnets .

Bugs said:

Nick, I'm with you. If the GPS doesn't measure altitude then it will underestimate your speed. Nice diagram.

I'm familiar with bike speedos - they work by having a magnet on the wheel move past a sensor on the bike fork (somewhere on the hanger on a skateboard). Basically it counts every revolution of the wheel, and multiplies that by the circumference of the wheel to get your speed. Because a bike wheel is quite large, inaccurate measurement of the wheel circumference is likely to be insignificant, but skateboard wheels are small so it'll throw things out significantly.

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Permalink Reply by pete on March 18, 2009 at 22:49

My understanding is that a GPS triangulates your position from 3 satellites - which ,without going into the maths of it, means that altitude is taken into account.

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Permalink Reply by Myles Borchardt on July 20, 2009 at 23:04

Just been reading up on your posts, and is are any of u in the gympie region? cause me and my mates all 15-16, and couple of us do speed boarding? Highest official speed i have got is 64, only time i had a GPS to hold, have gone to almost 75? "guessing" and yes, gps's use 3 satellites to work out your speed,

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Permalink Reply by Nick Threapleton on July 20, 2009 at 23:08

hey myles im brisbane but this weekend me and my mate are keen for a DH or corner session. Still havent worked out where at yet but if your keen let us know

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Permalink Reply by Myles Borchardt on July 21, 2009 at 21:06

sure thing, we were gonna check out the run at kilkivan, we have skated all the hills in gympie and are hungry for more, we def needa get together some time, were always keen tho!!!!!

Nick Threapleton said:

hey myles im brisbane but this weekend me and my mate are keen for a DH or corner session. Still havent worked out where at yet but if your keen let us know

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Permalink Reply by Ryan 'RY RY' Peterson on January 11, 2010 at 17:30

all that gps talk gave me a headache!
but yes nick posts a very good point!

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