Garmin on the track

It's actually not so good. I used it a lot on a well-marked collegiate track last year, and found that the curves really throw it off. I'd estimate about 5%. That doesn't sound like a lot, but trust me - you'll notice every last percent when you're doing stringently times intervals. This also wasn't due to lane variation - I ran in the same lane, every time. 

I actually use my garmin in "stopwatch" mode if I'm on the track. As much as I love the GPS, I turn it off or ignore it completely on the track. 

It's fine if you're not stringently timing yourself - 5% is no big deal on easy to moderate intensity runs. I just find that if I'm going to haul my rear to a track and run in loops, I'm usually doing very time-specific work, and the Garmin definitely fails for me for my intervals.

Thanks! I will use my other watch next time. I just liked the ease of uploading the work out to my computer!

Both my husband and I use ours at the track with no accurracy problems at all.

i've used my Garmin FR305 at the track and it's been pretty accurate. maybe within .01 miles off at times...

I also suspect the speed you're running makes a big difference in accuracy on the track.

I'm far from blazing fast, but I do run 800meter intervals at 5:45/mile and mile intervals at 5:50ish. If you recall, the Garmin  "samples" your location every second or so (actually less - it throws out extra straight line data points). So, the faster you go, the worse it will do on the curve.  If you're doing 9 minute miles or so, it may be a lot better on the curve, because it doesn't 'miss' the curve as much as when you're really hauling.