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From Fellrnr.com, Running tips
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Most My testing shows that Stryd is remarkably accurate, but the company has reported that there can be some variation between Stryd devices . If you'd like to check your calibration, I'd recommend this process. * Check that support your watch is set to get pace and distance from Stryd as . The best way I've found to verify this is to set the calibration factor to 0.5 and go for a Footpod short run. It will allow for be immediately obvious that your pace is only half what it should be.* Check the calibrationfactor is set to 1. I would strongly recommend 0, and that any auto calibration is disabled. Auto calibration uses GPS, which is going to be far less accurate than Stryd. * Use a standard 400 m oval track at a time when you 're confident you can run in a single lane for a number of laps.* You should run approximately 30cm/12" from the inside edge of the lane, not down the middle. For the first lane, running along the inside marker will reduce the distance by ~1m, running the outside edge will increase the distance by ~3m, and running down the middle will increase the distance by ~1m. * You don't attempt have to calibrate Stryd as it's so accuraterun down the first lane, but you have to adjust your distances for lanes that are farther out. (See table below.) * Start your watch and start running some distance before the start line. I think would suggest at least 100 m. This is partly because the stride will do some smoothing, and obviously when you're unlikely run starts you're going from stationary to make things better running. However, I've also noticed a number of watches that can be slow to start recording, so there first lap is rather than worseshort. You'll need to discard this first lap.* Run a number of laps hitting the lap marker as you parse the start, or some other landmark. * After the run, look at the lap distances for the measured laps, ignoring the first. The calculation is then fairly trivial; divide the actual lap distance by the average lap distance to give your calibration factor.{| class="wikitable" style="margin-left: auto; margin-right: auto; border: none;"! Lane! Total length|-| 1| 400.00 m|-| 2| 407.67 m|-| 3| 415.33 m|-| 4| 423.00 m|-| 5| 430.66 m|-| 6| 438.33 m|-| 7| 446.00 m|-| 8| 453.66 m|-| 9| 461. 33 m|}
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[[File:Stryd And Ultratrac.jpg|center|thumb|200px|Here's the GPS track, and hopefully you can see the straight lines that you get when the watch is in UltraTrac mode and only checking GPS infrequently. On the way back I had normal GPS mode.]]
=Calibrating Stryd=
=Stryd Internals=
For those that are interested, here are the internals of a Stryd. (Thanks for Paul Day for the photo and the willingness to do the work.)
