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Which is correct? Your Garmin or the RD? (Read 324 times)

    Or someone put a turn signal/cones in the wrong place.  Good for about .06 difference below.

     

    Certified course

     

    Actual race

     

    MTA fixed the links.  Also would not mind if Garmin measures a bit long, but if its short, assume a missed turn or wrong course ran.

    Or the Garmin can measure the certified course short, as mine did last Friday HERE.  Zoom in around the 2mi mark, and you can see how it has me running, Ferris Bueller style, through people's yards instead of the street.

    “Everything you need is already inside.” -- Bill Bowerman


    just a simple cat

       

      I run the some of the same routes pretty often. Although the readings from the Garmin are usually pretty close for the same route, every so often you get a reading that is quite a way off from the usual. So, whilst they usually seem to measure the same thing, it's not always so.

       

      swoon

       

      I  guess as you get more bodacious, you begin to lose more brain cells, because there is a limit to how much magnificence your body can house

        Or the Garmin can measure the certified course short, as mine did last Friday HERE.  Zoom in around the 2mi mark, and you can see how it has me running, Ferris Bueller style, through people's yards instead of the street.

        The reported distance by the Garmin itself was less than 3.11 miles?  That RA map reports 3.15 miles so just goes to show that there are no absolute accurate measurements of any course, or parameter for that matter.  We have three different distances - 5.0K+correction factor (certified course measurement), somewhat shorter than 5.0K (per Clive's GPS) and 3.15 miles (per RA's algorithmic interpretation of the raw GPS data).

          Or the Garmin can measure the certified course short, as mine did last Friday HERE.  Zoom in around the 2mi mark, and you can see how it has me running, Ferris Bueller style, through people's yards instead of the street.

           

          Could very well be the case with my run as well, looking at the course, that one turn at a different place should not be significant enough for coming up .06 short, esp given that I did not run anywhere close to perfect tangents.

           

          MTA zooming in, looks like it has me running through peoples yards and solid walls even for the ultimate tangents

            Ken, I had a bump-the-Start/Stop-button mishap somewhere around 2.2mi, so I manually entered a correction "interval" in the workout.  RA just drew a straight line between the shut-off and turn-back-on points mid-run.

            Smile

             

             

            But the track has me running off-road in lots of places.  I didn't mean to look only at that straight-line part!

            “Everything you need is already inside.” -- Bill Bowerman


            ultramarathon/triathlete

              Rick, I think I ran one of your races (NJ trail series, Jan 2012, had a blast).

               

              My garmin was way different than your course was said to be.  BUT before the start, you said it would be way different. Plus, I got way lost and doubled back twice.

               

              Also, I've run the loop in the park across from my apartment some 100s of times now.  Often I've started and ended the watch/run in the exact same place, with slightly different times.  I think cloud interference, full trees vs. winter trees, alien abduction and the weight of a 5 oz migrating coconut might sometimes be a factor.   Also, my Timex sometimes is different than my Garmin.

              So, I say Race Director.

              HTFU?  Why not!

              Coach: Empire Tri Club 

              Speed Coach: Brooklyn Tri Club
              USATF Coach

              zonykel


                I bet if you use a tape measure, wheel, or whatever is used to measure courses, if you do it multiple times, you'll get different distances as well.


                HobbyJogger & HobbyRacer

                   

                  Car odometers are pretty inaccurate. ..

                   

                  Liar. Hater. Cars will go on regardless of your hate and futile opposition.

                  It's a 5k. It hurt like hell...then I tried to pick it up. The end.


                  Oh roo roooo!

                    Last fall ran an out-and-back where the mile markers heading out were in wildly different locations than the mile markers heading back in....I received one of those little post-race survey things and took the opportunity to mention that on an out-and-back, not having your mile markers line up more or less across from each other would be an indication that an error (fairly large, in this case) has occurred and maybe re-measurement is called for.  RD's response was "yeah, we noticed that but didn't figure it really mattered."  All righty then.


                    just a simple cat

                      Rick, I think I ran one of your races (NJ trail series, Jan 2012, had a blast).

                       

                      My garmin was way different than your course was said to be.  BUT before the start, you said it would be way different. Plus, I got way lost and doubled back twice.

                       

                      Also, I've run the loop in the park across from my apartment some 100s of times now.  Often I've started and ended the watch/run in the exact same place, with slightly different times.  I think cloud interference, full trees vs. winter trees, alien abduction and the weight of a 5 oz migrating coconut might sometimes be a factor.   Also, my Timex sometimes is different than my Garmin.

                      So, I say Race Director.

                       

                      I also have a theory that the earth bulges more at some times and places....so the distance actually is slightly different each time you run it.........

                       

                      I  guess as you get more bodacious, you begin to lose more brain cells, because there is a limit to how much magnificence your body can house


                      HobbyJogger & HobbyRacer

                        I bet if you use a tape measure, wheel, or whatever is used to measure courses, if you do it multiple times, you'll get different distances as well.

                         

                        According to USATF, one needs a steel tape measure, a Jones counter, and a bicycle - also a thermometer.

                         

                        So, does anyone know if you can substitute for the bicycle:

                        • A cross-country hand wheel?
                        • A tricycle?

                        It's a 5k. It hurt like hell...then I tried to pick it up. The end.

                        zonykel


                           

                          I also have a theory that the earth bulges more at some times and places....so the distance actually is slightly different each time you run it.........

                           

                          If we're talking Yellowstone, I'd believe that.


                          325th place or bust!

                            I'm assuming you weren't running a 5K or 10K with mile markers?  In those cases the markers will not line up with each other on an out and back.  I suppose the general rule is that if the race is not a whole number (no fractional parts) in the marker units, then they won't line up.

                             

                            Last fall ran an out-and-back where the mile markers heading out were in wildly different locations than the mile markers heading back in....I received one of those little post-race survey things and took the opportunity to mention that on an out-and-back, not having your mile markers line up more or less across from each other would be an indication that an error (fairly large, in this case) has occurred and maybe re-measurement is called for.  RD's response was "yeah, we noticed that but didn't figure it really mattered."  All righty then.

                            PR: 5K 22:41, 10K 51:05, HM 1:59, Sprint Tri: done!


                            A Saucy Wench

                              Last fall ran an out-and-back where the mile markers heading out were in wildly different locations than the mile markers heading back in....I received one of those little post-race survey things and took the opportunity to mention that on an out-and-back, not having your mile markers line up more or less across from each other would be an indication that an error (fairly large, in this case) has occurred and maybe re-measurement is called for.  RD's response was "yeah, we noticed that but didn't figure it really mattered."  All righty then.

                               

                              Well, even a certified course is not required to have mile markers in the appropriate locations.  The start and finish are certified, mile markers are a courtesy

                               

                              We have a race here that they changed the route and the new course is only measured by running it 3 times with a Garmin.  It is shorter than the old course but they keep insisting the new PR's are only because they took out a hill.  (both an up and a down)

                              I have become Death, the destroyer of electronic gadgets

                               

                              "When I got too tired to run anymore I just pretended I wasnt tired and kept running anyway" - dd, age 7

                                 According to USATF, one needs a steel tape measure, a Jones counter, and a bicycle - also a thermometer.

                                 

                                So, does anyone know if you can substitute for the bicycle:

                                • A cross-country hand wheel?
                                • A tricycle?

                                 

                                Nope, they are pretty specific.  66 pages of specific.  I find it pretty interesting, believe it or not.  They tell you things like how much you have to adjust for the thermal expansion/contraction of your steel calibration tape, and with how much force you should stretch it.  And a lot more.

                                Well at least someone here is making relevance to the subject.

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