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Measuring the distance of the 3 miler!

Discussion in 'General Royal Marines Joining Chit Chat' started by MisterP, Feb 28, 2008.

  1. MisterP

    MisterP New Member

    Joined:
    Feb 10, 2008
    Posts:
    28
    Can I just ask how people are measuring their runs?

    The reason I want to know is that I've just noticed a massive discrepancy in the length of my run depending on how I measure it. I had measured it using the measuring tool with Google earth, and was happy with that; but I've just been out on my bike and my bike speedometer says I've completed 1.5miles 160metres before google earth says I have. This could be a difference of maybe 30 to 40 seconds over the 1.5mile best effort back!!

    (i've checked my bike speedometer's calibration, which is set to 2099 for the 26*2.0 measurement on the tyre. But i suspect this may still be wrong).

    Does anyone know how accurate google earth is and/or of a more accurate way to calibrate a bike speedometer????

    Ps. i've now tried measuring 2 different 400metre running tracks using google earth and i was only 2m and 1.5m out with each - which is making me think that google earth is pretty accurate.
     
  2. smithy85

    smithy85 New Member

    Joined:
    Jan 12, 2008
    Posts:
    55
    Hello MisterP, try using www.mapmyrun.com thats a pretty accurate way of sorting out your problem i think. hope it helps. Smithy.
     
  3. ZZ

    ZZ New Member

    Joined:
    Feb 5, 2008
    Posts:
    736
    yeah i use google map to and find its pretty accurate. i just get my mum to drive my route in her car and it seems to come up near enough the same. but dont forget 0.1 of a mile is a fair distance so on google you would have to move the little flag thingy until it just gets onto 1.5 or something. because i always woundered why my 1 mile was pretty slow when i used to just run that and its because i was nearing on like 1.1 in just another hundred, dsoesn't make too much difference really though
     
  4. Azza01

    Azza01 New Member

    Joined:
    Feb 19, 2008
    Posts:
    48
    Map my run website is great ive used it religously for measuring the runs i do, Ive measured it against the car and its only slightly different...
     
  5. ZZ

    ZZ New Member

    Joined:
    Feb 5, 2008
    Posts:
    736
    *text deleted* im really confused now, i was running a route i planned on google and it was 1.5 then i planed it on that mapmyrun.com and its only 1.4 i dont know which to trust
     
  6. ZZ

    ZZ New Member

    Joined:
    Feb 5, 2008
    Posts:
    736
    ahhh and i just checked my 3 miler and its only 2.8 according to mapmyrun

    - Edit: i official hate mapmyrun, its saying my google planned runs are either 0.1 or 0.2 miles out on each
     
  7. MisterP

    MisterP New Member

    Joined:
    Feb 10, 2008
    Posts:
    28
    Be careful ZZ, 0.1 of a mile is 161 metres, which is very easily the difference between a pass and a fail.

    Also ZZ, I don't know about you, but on my google earth i can measure (supposedly) to less than a metre. On the measuring thingy, click on the drop down menu and select metres instead of miles. (1609.3m per mile, 2414m in 1.5 miles)
     
  8. Azza01

    Azza01 New Member

    Joined:
    Feb 19, 2008
    Posts:
    48
    Probably a good idea to match it in the car if your unsure, also if your unsure just run a few hundred meteres more and even if its more and you still pass it time wise you'll be fine...
     
  9. Ninja_Stoker

    Ninja_Stoker Admin

    Joined:
    Jul 10, 2007
    Posts:
    34,502
    Best bet, logically is ensure your run reads the full required distance on whichever software indicates it's the shortest distance.

    Whilst you need to run 2.4Km/1.5 miles for the PJFT, you should be increasing your distances to 3 miles for PRMC, pushing the distance out to around 5 miles at least once per week in the month leading-up to taking your PRMC for the best chance of passing according to "those that know".