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Calibrating a footpod that is already calibrated?
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 2006-10-16 9:04 AM |
Expert  1168   |  Subject: Calibrating a footpod that is already calibrated?I have a polar footpod that is currently calibrated with a setting of 0.978. This was set back in May and I went through a couple of pairs of shoes since then so this needs to be updated. Anyways, I ran a marathon on Saturday (the course is certified) and at the end the distance on my watch read 26.81. My question is, how do I calibrate it again with the current setting in there too. Would this be right: (26.2/26.81)*0.978=0.955 So, according to this 0.955 would be the new setting (if thats right). Also, 26.2/26.81 = 0.977 which is awefully close to the first calibration. Could it be possible that for some reason the current calibration is not in affect? I had the watch rest on me a couple of times over the summer, but the setting is still in there. -Rob |
| 2006-10-16 9:14 AM in reply to: #569809 |
Not a Coach 11473  Media, PA | Subject: RE: Calibrating a footpod that is already calibrated? In theory, your calculation is correct. But remember the 26.2 is certified over the shortest route along the course. If you did any weaving or didn't take the turns tight you have actually run a bit longer. So there's a good chance your calibration factor may fall somewhere between 955 and 978. |
| 2006-10-16 9:28 AM in reply to: #569819 |
Champion 6627 Rochester Hills, Michigan Gold member | Subject: RE: Calibrating a footpod that is already calibrated? JohnnyKay - 2006-10-16 10:14 AM In theory, your calculation is correct. But remember the 26.2 is certified over the shortest route along the course. If you did any weaving or didn't take the turns tight you have actually run a bit longer. So there's a good chance your calibration factor may fall somewhere between 955 and 978. Johnny is right. I just ran a half marathon 13.1 that clocked out at 13.5 mi on the polar. Running .4 mi sideways is pretty accurate, IMHO. The only way to get ANY more accurate is to get a straight shot, point-to-point run of a mile and calibrate it there, OR go to a track and hug the inside white line and recalibrate. |
| 2006-10-16 9:58 AM in reply to: #569809 |
Veteran 279 Tucson, AZ | Subject: RE: Calibrating a footpod that is already calibrated? Aside from what these guys are saying, another way to look at it, is that it says you went 1.023 miles for every 1 mile you actually ran (assuming you ran 26.2, nothing more, nothing less). That's pretty damn close if you ask me. 97.7% accurate if my math is right... |
| 2006-10-16 10:34 AM in reply to: #569809 |
Champion 6993 Chicago, Illinois | Subject: RE: Calibrating a footpod that is already calibrated? only way to really be sure the pod is acurate is on a track so you know the exact distance and do not have to worry about running all the tangents. I know the chicago marathon it more than easy to run over 27 miles because of the crowds of people. |
| 2006-10-16 10:39 AM in reply to: #569859 |
Expert 1168 | Subject: RE: Calibrating a footpod that is already calibrated? Carl Carlson - 2006-10-16 9:58 AM Aside from what these guys are saying, another way to look at it, is that it says you went 1.023 miles for every 1 mile you actually ran (assuming you ran 26.2, nothing more, nothing less). That's pretty damn close if you ask me. 97.7% accurate if my math is right... Yeah, its pretty close, but .03 mi extra for 26.2 miles miles put the race .6 mi over what it should be on my watch, which is a significant amount. Thanks for the replies everybody. Ill probably measure out a run with my bike and calibrate it like that. Anybody have any luck with that? -Rob |
| 2006-10-16 11:09 AM in reply to: #569914 |
Not a Coach 11473 Media, PA | Subject: RE: Calibrating a footpod that is already calibrated? pseudoyams - 2006-10-16 10:39 AM Thanks for the replies everybody. Ill probably measure out a run with my bike and calibrate it like that. Anybody have any luck with that? You have to assume your bike computer is calibrated accurately, but otherwise it should work. |
| 2006-10-16 11:30 AM in reply to: #569914 |
Champion 6993 Chicago, Illinois | Subject: RE: Calibrating a footpod that is already calibrated? pseudoyams - 2006-10-16 10:39 AM Yeah, its pretty close, but .03 mi extra for 26.2 miles miles put the race .6 mi over what it should be on my watch, which is a significant amount. Thanks for the replies everybody. Ill probably measure out a run with my bike and calibrate it like that. Anybody have any luck with that? -Rob I will have to look but I think my footpod had chicago marathon at 28 - 29 something miles so talk about off. my GPS was off about .4 miles at Milwaukee. I had marathons right on before with it. Really what I do during a race is when I hit a mile marker and then I check my watch. Usually it beeps at the mile also so I can see exactly how far it is off at the marker I am. so if I mile 9 it says 9.2 and my watch beeps for mile 10 I know I have .2 miles left to go. What I should do is hit the split button because it will auto split after a mile and not at each mile so I can sort of fix the error but even still. I guess it shows that these tools are good but we are getting too dependant on them. Back int he day all you had would be a watch and know at mile 9 you had to be at this pace and if you were not you had to pick up the pace for the next mile. |
| 2006-10-16 11:33 AM in reply to: #569914 |
Veteran 279 Tucson, AZ | Subject: RE: Calibrating a footpod that is already calibrated? pseudoyams - 2006-10-16 11:39 AM Carl Carlson - 2006-10-16 9:58 AM Aside from what these guys are saying, another way to look at it, is that it says you went 1.023 miles for every 1 mile you actually ran (assuming you ran 26.2, nothing more, nothing less). That's pretty damn close if you ask me. 97.7% accurate if my math is right... Yeah, its pretty close, but .03 mi extra for 26.2 miles miles put the race .6 mi over what it should be on my watch, which is a significant amount. Thanks for the replies everybody. Ill probably measure out a run with my bike and calibrate it like that. Anybody have any luck with that? -Rob I guess it all depends on your definition of significant... is 2.3% worth getting excited over? I know we're all type-A control freaks, but how much more accurate can you expect it to get? Doesn't the manufacturer only guarantee up to 97% accuracy or something? As far as calibrating based on a bike ride... I've thought of doing this, but then it's only going to be as accurate as your bike.... it's all relative. |
| 2006-10-16 11:42 AM in reply to: #569949 |
Champion 6627 Rochester Hills, Michigan Gold member | Subject: RE: Calibrating a footpod that is already calibrated? JohnnyKay - 2006-10-16 12:09 PM pseudoyams - 2006-10-16 10:39 AM Thanks for the replies everybody. Ill probably measure out a run with my bike and calibrate it like that. Anybody have any luck with that? You have to assume your bike computer is calibrated accurately, but otherwise it should work. Maybe take your bike to the track. ?!? |
| 2006-10-16 11:43 AM in reply to: #569975 |
Expert 1168 | Subject: RE: Calibrating a footpod that is already calibrated? I guess it all depends on your definition of significant... is 2.3% worth getting excited over? Actually, yeah. It comes out to be about :09 faster of a pace than actual. Actual pace was 7:22/mi and watch read 7:13/mi because of the extra mileage. As far as calibrating based on a bike ride... I've thought of doing this, but then it's only going to be as accurate as your bike.... it's all relative. Yup, I agree. But, the bike is measured down to a few mm and its a good start to get a more accurate ready. Of course, there are other variables with this like tire pressure, the time the computer takes to pick up the sensor readings, turns, etc. But, it seems like a decent place to start especially since you are supposed to calibrate it on the terrain you usually run. -Rob |
| 2006-10-16 11:57 AM in reply to: #569989 |
Champion 6993 Chicago, Illinois | Subject: RE: Calibrating a footpod that is already calibrated? Plus do not forget that with the food pod to get a really accurate result you need to run at a constant speed. In other words if I hill comes along you better run at the same speed you run flat if not you can be inaccurate there also. I know for me when I used mine a hilly course = more errors since well you get the foot pod going and takes awhile before it slows down. Even professional marathoners I bet will run most marathons at around 26.3 miles if they are a good crowd of them because if person a and person b running side by side 1 will have to run a little farther around any turn. |
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