Author: Sorting Last Post on Top ↓ Message:
JOEKHUL's Photo JOEKHUL Posts: 1,802
8/10/12 2:39 P

My SparkPage
Send Private Message
Reply
Your race directors use technology to measure the distance? Around here i think they just eye it up.

2011 Goal: Superior Sawtooth


 current weight: 210.0 
 
210
196.25
182.5
168.75
155
WINACHST's Photo WINACHST SparkPoints: (13,995)
Fitness Minutes: (13,440)
Posts: 1,506
8/3/12 8:50 A

Community Team Member

My SparkPage
Send Private Message
Reply
@ Tykxboy "But it also depends on which side of the road you are running on. Run on one side and it could underestimate it... run on the other... :)"

Ahh, I now have an explanation as to why my back on my 'out and back' run is longer than the out portion, I cross the street when I turn around. :-)

Nancy

Team Leader For Taming The Sweet Tooth Team
teams.sparkpeople.com/TamingSweetToo
th
TYKXBOY's Photo TYKXBOY SparkPoints: (41,964)
Fitness Minutes: (35,216)
Posts: 848
1/9/12 1:30 P

My SparkPage
Send Private Message
Reply
Of course, just because your gps CAN be fairly inaccurate doesn't mean it WILL be.

Today, I ran a route that I mapped out on mapmyrun.com as being 11.08 miles. My Android smartphone - using the imapmyrun app - mapped it out during my run to be 11.1 miles. The line is still zig-zaggy, but it cuts a few key corners to end up being pretty close. There's no way I could actually physically follow the route as my GPS mapped it out, but the end distance is pretty darn close. That's what most of us are looking for, anyway. We're not rocket scientists. :)

Another accuracy factor is the app or software that's doing the mapping and how often it takes a reading. Often, during a long run, an app will take fewer readings which will straighten out some of the zigs and zags. This is especially true of free or low-cost apps. These apps often limit the number of readings that can be taken and saved which makes the lines straighter on your long runs, but cuts a lot of corners as it eliminates points. In any case, the software can still only be as accurate as the grade of Gps being used. So, sometimes accuracy is actually just luck. :)

"One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man." ~ Elbert Hubbard (1856 - 1915)


SALTYCHOCOLATE's Photo SALTYCHOCOLATE Posts: 9,424
1/7/12 4:42 P

My SparkPage
Send Private Message
Reply
Thanks for the information. I was curious so I mapped a route on mapmyrun twice - once using "follow roads" and the other time not using the "follow roads". When I didn't use the "follow roads" I made sure that I was mapping on the side of the street on which I run and follow the road exactly. Well, both routes ended up being exactly the same distance. The problem I had with NOT using the "follow roads" is that it cut off a lot of bends in the road so I had to manually adjust the route to match exactly what I run. My routes tend to be out-and-backs so I'll run down one side and come back up the other. Also, there are very few spots on any of my routes where the road is straight.

And thanks for the blog about the differences in the types of GPS. I didn't realize that there are three types. Your examples really helped to clarify how each type differs.

Respect life.

An attitude of gratitude can wipe away bad thoughts anytime.
- A fellow Sparker

I bleed coffee and chocolate

Fab 40's co-team leader
www.sparkpeople.com/myspark/groups_i
ndividual.asp?gid=11525


Bikram Yoga Lovers Team leader
www.sparkpeople.com/myspark/groups_i
ndividual.asp?gid=11285


 Pounds lost: 2.0 
 
0
2.75
5.5
8.25
11
TYKXBOY's Photo TYKXBOY SparkPoints: (41,964)
Fitness Minutes: (35,216)
Posts: 848
1/6/12 8:16 P

My SparkPage
Send Private Message
Reply
Most likely it would overestimate your total. But, if you run in a straight line, it won't overestimate by much. The more times you turn corners, more more it will overestimate. But it also depends on which side of the road you are running on. Run on one side and it could underestimate it... run on the other... :)

"One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man." ~ Elbert Hubbard (1856 - 1915)


SALTYCHOCOLATE's Photo SALTYCHOCOLATE Posts: 9,424
1/6/12 8:13 P

My SparkPage
Send Private Message
Reply
By the way, I can run sort of "off hours" so it's not uncommon for me to run down the middle of the road. And sidewalks are far and few between on my routes so I really am running along the road.
Thanks again.

Respect life.

An attitude of gratitude can wipe away bad thoughts anytime.
- A fellow Sparker

I bleed coffee and chocolate

Fab 40's co-team leader
www.sparkpeople.com/myspark/groups_i
ndividual.asp?gid=11525


Bikram Yoga Lovers Team leader
www.sparkpeople.com/myspark/groups_i
ndividual.asp?gid=11285


 Pounds lost: 2.0 
 
0
2.75
5.5
8.25
11
SALTYCHOCOLATE's Photo SALTYCHOCOLATE Posts: 9,424
1/6/12 8:11 P

My SparkPage
Send Private Message
Reply
@TYKXBOY So, do you think "follow roads" would overestimate or underestimate the mileage? Again, I don't have a garmin so I need to use mapmyrun. The satellite view is nearly impossible for me to use unless I use "follow roads" because there are just way to many trees and I can't tell if I'm following the roads or not. Plus, I run on a lot of roads that have any thing from minor bends to winding curves. Would it be better for me to use the map view and just not use the "follow roads"?
Thanks so much and sorry to be such a pain.

Edited by: SALTYCHOCOLATE at: 1/6/2012 (20:14)
Respect life.

An attitude of gratitude can wipe away bad thoughts anytime.
- A fellow Sparker

I bleed coffee and chocolate

Fab 40's co-team leader
www.sparkpeople.com/myspark/groups_i
ndividual.asp?gid=11525


Bikram Yoga Lovers Team leader
www.sparkpeople.com/myspark/groups_i
ndividual.asp?gid=11285


 Pounds lost: 2.0 
 
0
2.75
5.5
8.25
11
FREEDOMSTAR's Photo FREEDOMSTAR Posts: 13,845
1/6/12 7:38 P

My SparkPage
Send Private Message
Reply
GPS- is pretty accurate.

does anyone use the foot pod for indoor running ? ( treadmill)

C0-Team leader of Change is Good and Half Marathon Team, Support panel of The Best Life Diet


 current weight: 182.0 
 
222
212
202
192
182
TYKXBOY's Photo TYKXBOY SparkPoints: (41,964)
Fitness Minutes: (35,216)
Posts: 848
1/6/12 7:35 P

My SparkPage
Send Private Message
Reply
@SALTYCHOCOLATE - If you map it out by hand by drawing the lines yourself on your PC, it is usually more accurate than trusting your GPS results, yes. Or you can import your GPS results and then fix them up by hand. It's pretty much the same thing. I recommend doing it in satellite view rather than map view, that way you can make sure your route follows all the sidewalks and other paths that you followed during your run. It's still not perfect, but it's about as close as you can get without going outside with a measuring wheel or a surveyor's rod & level.

However, if you use the "snap to roads" feature - or try to follow the road line in "map view," it will reduces the accuracy of your lines because nobody runs down the centerline of every street and makes 90 degree turns at every intersection. I'm not sure if that's more or less accurate than using a GPS.

Edited by: TYKXBOY at: 1/6/2012 (19:37)
"One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man." ~ Elbert Hubbard (1856 - 1915)


SALTYCHOCOLATE's Photo SALTYCHOCOLATE Posts: 9,424
1/6/12 7:23 P

My SparkPage
Send Private Message
Reply
So, is everyone saying that the mileage on mapmyrun is more accurate than the mileage on a gps? I don't have a gps but I do use mapmyrun.

Respect life.

An attitude of gratitude can wipe away bad thoughts anytime.
- A fellow Sparker

I bleed coffee and chocolate

Fab 40's co-team leader
www.sparkpeople.com/myspark/groups_i
ndividual.asp?gid=11525


Bikram Yoga Lovers Team leader
www.sparkpeople.com/myspark/groups_i
ndividual.asp?gid=11285


 Pounds lost: 2.0 
 
0
2.75
5.5
8.25
11
TYKXBOY's Photo TYKXBOY SparkPoints: (41,964)
Fitness Minutes: (35,216)
Posts: 848
1/6/12 11:44 A

My SparkPage
Send Private Message
Reply
Yes, it does! I use imapmyrun to track my runs. When I come home (after i shower and eat, of course), I log in to the website and promptly sit down and straighten out my route so I get a more accurate estimate of my mileage. It's crazy looking at how much that line weaves all over the place. It's usually off by at least a couple tenths of a mile. What the GPS on my phone told me was 10.7 mile run, last weekend, was really closer to 10.5.

"One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man." ~ Elbert Hubbard (1856 - 1915)


FREEDOMSTAR's Photo FREEDOMSTAR Posts: 13,845
1/6/12 11:37 A

My SparkPage
Send Private Message
Reply
I ran my first marathon in May and garmin read 43.09K I was informed that all the zig zagging adds up over such a long distance. It made sense to me.


John

C0-Team leader of Change is Good and Half Marathon Team, Support panel of The Best Life Diet


 current weight: 182.0 
 
222
212
202
192
182
TYKXBOY's Photo TYKXBOY SparkPoints: (41,964)
Fitness Minutes: (35,216)
Posts: 848
1/6/12 11:33 A

My SparkPage
Send Private Message
Reply
@FREEDOMSTAR - That's one reason, but there's more. :)

"One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man." ~ Elbert Hubbard (1856 - 1915)


FREEDOMSTAR's Photo FREEDOMSTAR Posts: 13,845
1/6/12 11:31 A

My SparkPage
Send Private Message
Reply
tangents

C0-Team leader of Change is Good and Half Marathon Team, Support panel of The Best Life Diet


 current weight: 182.0 
 
222
212
202
192
182
TYKXBOY's Photo TYKXBOY SparkPoints: (41,964)
Fitness Minutes: (35,216)
Posts: 848
1/6/12 11:30 A

My SparkPage
Send Private Message
Reply
I posted this blog a couple days ago and I know a bunch of you have already read it, but I thought it might be interesting to a lot of other runners who are not my immediate SparkFriends (and that's a lot you!) as I know Garmins and other portable GPS devices are very popular.

Tip: Why Your Garmin GPS Mileage Is Off...
www.sparkpeople.com/mypage_public_jo
ur
nal_individual.asp?blog_id=4657789


GPS Accuracy Addendum
www.sparkpeople.com/mypage_public_jo
ur
nal_individual.asp?blog_id=4659461


"One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man." ~ Elbert Hubbard (1856 - 1915)


Page: 1 of (1)  

Report Innappropriate Post

Other Road Runners Gadgets & Gear Posts

Topics: Last Post:
Runkeeper Cheering Squad 6/5/2014 10:02:36 AM
Watch and Music Device Choices? 11/17/2013 5:00:29 AM
GPS/Pacing watches 1/22/2014 9:37:33 AM
My minimalist shoes arrived today! 9/14/2013 11:25:46 PM
Mizuno Wave inspire 9 1/14/2014 9:53:16 PM

Thread URL: http://www.sparkpeople.com/myspark/team_messageboard_thread.asp?board=20104x123x45859930

Review our Community Guidelines