I don't know that I'd agree with Marnee that the car is less accurate than mapmyrun. That's not been my experience. I had pretty good luck with mapmyrun.com until just recently. I measured a new route and after logging a few runs with times much faster than they should have been I got suspicious. I drove the route and it came up a good .3 miles short. My run times would support that. I don't trust mapmyrun.com anymore. Fortunately DH gave me a Garmin for my B-Day so now I'm good to go.

That being said, that new route is the only time that mapmyrun.com has let me down so overall I'd say it's fairly accurate. I'd prefer to underestimate my distance rather than overestimate though.

That's so funny that you ask this, I had some weirdness with mapmyrun, I planned out an 8 mile route one time, and then when I came home to do the stats, plotted out the same route and it said 7.5 miles. I don't think it is always accurate.

Yes, this is correct. You need to use the satelite or hybrid view. Occasionally, the road on the default view doesn't follow the actual road that you see in the satelite view.

I would trust MayMyRun, and the multitude of other options, before I trust my car odometer. My Garmin has been very close to distances I get with the online mapping tools.

Victor

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How can you measure distance on a trail using MapMyRun?
Trails do not show up on a street view and it is hard to
trace a trail that wind thru a wooded area on a satellite view

Is there such a thing as bike odometer? We can use it to
estimate a distance on a course off limits to cars.

http://This message has been edited by jingchunyu (edited Nov-06-2007).