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Old 05-23-2011, 10:27 AM   #1
kibitzer
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GPS laptimer build attempt

After finally trying a MiniXT laptimer at MSRH I really want to try get a GPS laptimer. The MiniXT did it's job perfectly, but I'm reluctant to always rely on someone to bring a beacon or have to lug one myself. With a GPS it'd be completely self sufficient and can support multiple split points to know where progress is being made or lost.

Downside is that GPS timers are extremely expensive for reliable ones. The cheapest I've seen are Starlane and they seem to spend as much time broken as they do running.

So I've found software that works on some smart phones and 5HZ GPS recievers are extremely cheap. I just need to find a phone on the cheap to get the ball rolling.

Anyone have any one of the following phones just lying around they are willing to part with for a reasonable price?

Nokia E50, E51, E60, E61, E61i, E62, E63, E65, E66, E70, E71, E90, N71, N73, N75, N76, N77, N80, N81, N81-8GB, N82, N91, N92, N93, N93i, N95, N95-8GB, 3250, 5500 Sport, 5700 XpressMusic, 6110 Navigator, 6120 Classic, 6121, 6124 Classic, 6290, Samsung SGH-i400, SGH-i450, SGH-i520, SGH-i550, SGH-i560, SGH-G810, SGH-L870, INNOV8, I7110, LG KS10, KT610.

After I get everything set up I'll test the rig and post the resuts.
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Old 05-23-2011, 10:34 AM   #2
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try refurbdepot or ebay.

you can prolly get those unlocked for stupid cheap.
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Old 05-23-2011, 11:03 AM   #3
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I'm checking those too.
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Old 05-24-2011, 05:36 AM   #4
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I think GPS lap timers are the way to go. I have an app for my iphone, but it doesn't seem to get a good signal while in then inside pocket of my leathers. I just need to buy one.
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Old 05-24-2011, 06:03 AM   #5
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Quote:
Originally Posted by MrBoom View Post
I think GPS lap timers are the way to go. I have an app for my iphone, but it doesn't seem to get a good signal while in then inside pocket of my leathers. I just need to buy one.
The problem with all internal gps sets on smart phones is that they are limited to a 1hz update. So you only get a position marker every 1 second. That's generally not accurate enough as a track timer.

You take something like this:



and bluetooth link it to a phone for a 10hz update rate. Far higher accuracy.

Load Racechrono on the phone to give you a running laptimer. Then load the data into Racechronoavi for this:

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Old 05-24-2011, 07:52 AM   #6
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Surprise ending. At least for Brad.

Any easy way to search out which phones have a higher update rate?
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Old 05-24-2011, 08:03 AM   #7
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Quote:
Originally Posted by +Travis+ View Post
Surprise ending. At least for Brad.

Any easy way to search out which phones have a higher update rate?
As far as I know there aren't any that have the accuracy required. A seperate BT GPS receiver is the easiest and cheapest route to go. The money spent to get a phone capable of that, if there is one, would be better spent on a retail GPS lap timer that would fair much better in a wreck.
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Old 05-24-2011, 08:07 AM   #8
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Quote:
Originally Posted by kibitzer View Post
As far as I know there aren't any that have the accuracy required. A seperate BT GPS receiver is the easiest and cheapest route to go. The money spent to get a phone capable of that, if there is one, would be better spent on a retail GPS lap timer that would fair much better in a wreck.
Oh, duh -- I hadn't fully understood your previous post -- I get it now. That is a great idea!
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