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Discussion Starter · #1 ·
When you use a GPS or a mapping site to get your mileage, is it only measuring flat distance between points, or is it actually getting all the mileage of the ups and downs of the route?
 

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Yes, I am having a disagreement with my husband about how far we ran this morning. <img alt="wink.gif" src="http://files.kickrunners.com/smilies/wink.gif"><br><br>
His GPS seems to be underestimating the mileage, based on my usual pace.
 

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there is a program that the garmin should upload into should account for the elevation and give you a more accurate reading. GPS without those alterations will not take that into account.
 

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I am not an expert on GPS measurement systems, but the method is simply to find a point in space based on three or more known vectors. If the vectors do not perfectly align at a ingle point then some formula probably kicks in to eliminate the error by adjusting one or more of the vectors.<br><br>
It seems to me that the math would not work out very accurately then, if vertical displacement were not taken into consideration.
 

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I believe the GPS only takes into account the horizontal distance.<br><br>
If we're talking trig you have to run some pretty epic hills to make the distance much bigger! <img alt="surprised.gif" src="http://files.kickrunners.com/smilies/surprised.gif">
 

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Dude!<br><br>
They need to be mountains to make it out of the second decimal place. The huge effort of going up/down those hills will matter much more than the change in distance.
 

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<br>
Does it really matter? It's only training mileage after all; who cares if it's within 500 metres either way.<br>
I'd be inclined to estimate your mileage based on your usual pace.<br><br>
Another reason why we don't have world records in road and cross country events.
 

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Discussion Starter · #8 ·
<img alt="smile.gif" src="http://files.kickrunners.com/smilies/smile.gif"> We got over it.<br><br>
I recorded my mileage my way, he recorded his mileage his way.
 

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Discussion Starter · #9 ·
I take that back. It does matter in that he is also interested in knowing when he will need to pick me up after a 25 mile trail event.
 
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