DCM 2016. My Garmin said 42.6K

Finglas Flier

Was wondering if anybody else has a finishing distance similar to this?
I know there can be drift within the course distance but I usually run as close to center of the road as possible. My GPS was working fine but the parameters seem a little extreme...
Anybody else experienced that?

BrokenMan

The centre of the road isn't the shortest possible route. So straight away you are going to be running over the measured distance. This and normal inaccuracy in Garmins would easily account for the extra distance recorded.
There is no way on earth the course on Monday was long.

Ososlo

I ran 26.8 miles in DCM 2013! I've since learned what the 'racing line' means!

Gavlor

Finglas Flier wrote: »

Was wondering if anybody else has a finishing distance similar to this?
I know there can be drift within the course distance but I usually run as close to center of the road as possible. My GPS was working fine but the parameters seem a little extreme...
Anybody else experienced that?

It would have probably measured more accurately in miles

Finglas Flier

I use to set my watch for miles but a few years back started using kilometers as the* beep*camp round quicker... :-)
In most of my readings on long distance running...it was always advised (and some what proven) that running near the center always reduced your over all drift. I must re evaluate this so... :-)

BrokenMan

Apex to apex on each corner is the shortest route. Obviously it's not always possible to run this due to crowds but it can definitely save you time if you run as tight as possible. The amount of people I see just sticking to the left side of the road on long sweeping right handers amazes me. The course is long enough without adding distance to it.

RayCun

BrokenMan wrote: »

There is no way on earth the course on Monday was long.

The course is a little long actually - for road races the measurer adds a bit to make extra sure the course isn't short. But the garmin's margin of error is higher than the safety margin added by the measurer, and leaving the racing line will add more

clear thinking

Road courses are measured with a margin of error, I thin its 1% so 42.2 becomes 42.62.

I'm no expert, but I'd assume this is to allow for corner cutting that most athletes will make use of, i.e. if you were concentrating you could have hit 42.2 by taking the shortest possible route. Maybe we have one of the accredited measurers posting here?

Even on a 10k road course this can cost or save you a good minute.

RayCun

the procedure is documented here

or you could find ultraman and tell him your garmin says a course was wrong, and he'll ensure that for the rest of your life you'll always have a Jones counter close by (if perhaps difficult to read)

ger664

GPS is never accurate and nearly always measures longer then the actual distance. I ignored my on Sunday in Frankfurt due to the tall buildings in the city center playing havoc with signal. Ran the blue Line as best I could watch showed 43.6K.

The best way to pace a race is with a stop watch, and pace band. Downside is you a relying on the RD having the mile/K markers in the correct spot. On Sunday every K marker in Frankfurt was exactly in line with the spray mark on the road.

Krusty_Clown

Chivito550

Krusty_Clown wrote: »

But it is a perfectly good way of measuring a 100m for a post match time trial on a GAA pitch....

Finglas Flier

Cheers guys for the input..
I shall refrain from contacting DCM organizers to have my time reduced by the extra 2.40 mins above and beyond...

The Davestator

In the Paris marathon, they have the racing line painted on the road. Not that it was much use due to the crowds though

Krusty_Clown

Chivito550 wrote: »

But it is a perfectly good way of measuring a 100m for a post match time trial on a GAA pitch....

Should work fine in a straight line. Every sprinter should have one. Best way to improve your PBs.

robinph

I got 26.27 recorded on my Garmin which is one of the "shorter" marathons I've probably ever recorded.

But was surprised how many people were running the long way round bends at my pace on Monday. Some long wide corners especially through the park and people just blindly followed the person infront. Now it was windy and you could almost justify following the person infront so as to get a bit of shelter in those conditions, but people were too far spread out for that to have been the issue, just by switching from apex to apex through those sections I was passing loads of people running a much longer route despite being potentially a bit more exposed to the head wind. In Dublin after the first few miles it was plenty open enough field to take whatever line you wanted across the road at the 3-3:10 pace.

Was also weird to see people cut the corner on a right angled bend and hop across the kerbs where the only real gain is potentially a sprained ankle. But then the next curve they would stick to the outside and run 10's of meters further just on that one corner.

ultraman1

clear thinking wrote: »

Road courses are measured with a margin of error, I thin its 1% so 42.2 becomes 42.62.
e.

.001%....so makes it 42.2 metres longer

TFBubendorfer

ultraman1 wrote: »

.001%....so makes it 42.2 metres longer

You need to work on your maths skills, Anto :rolleyes:

28064212

It's 0.1%, or 42m, making the maximum distance 42.237km

Rule 240.3 wrote:

The length of the course shall not be less than the official distance for the event. In competitions under Rules 1.1(a), (b), (c) and (f), the uncertainty in the measurement shall not exceed 0.1% (i.e. 42m for the Marathon) and the length of the course should have been certified in advance by an IAAF approved course measurer.

ultraman1

28064212 wrote: »

It's 0.1%, or 42m, making the maximum distance 42.237km

Thats wat i ment

Hard Worker

Finglas Flier wrote: »

Cheers guys for the input..
I shall refrain from contacting DCM organizers to have my time reduced by the extra 2.40 mins above and beyond...

If you had sent in such a query, you would have joined the dozens of others who similarly query the distance. We just inform people that we measure the course with a Jones Counter and not a Garmin. We've had a few responses wondering where they can purchase a Jones Counter ( obviously, they want to have the most accurate piece of equipment with them for each run ).

average_runner

Hard Worker wrote: »

If you had sent in such a query, you would have joined the dozens of others who similarly query the distance. We just inform people that we measure the course with a Jones Counter and not a Garmin. We've had a few responses wondering where they can purchase a Jones Counter ( obviously, they want to have the most accurate piece of equipment with them for each run ).

Maybe send them this link http://www.jonescounter.com.

Is there a reason why there is no marathon line painted, probably the council?

Finglas Flier

I know Garmin are not the official distance markers...was more wondering if any runners who use Garmin devices had noticed a longer run??? I had only noticed it when I was uploading to my computer after the event.....

Thanks again for the inputs... :-)

km991148

"DCM 2016. My Garmin said 42.6K" - More surprised the Garmin can do time travel - well done on the future marathon

I just retraced a couple of recent runs on http://mapmydistance.com/ that were recorded with the phone - each one was a good bit longer on the phone.. and by a disappointingly good bit - i.e. 4.83km on mapmydist vs 5.1 on the phone

Finglas Flier

km991148 wrote: »

"DCM 2016. My Garmin said 42.6K" - More surprised the Garmin can do time travel - well done on the future marathon

LOL..... :-)
Had not spotted that....nice one......LOL