Garmin

3 lurkers | 223 watchers

quimby May 2021 1:39pm, 30 May 2021 4,796 posts	quimby A recommendation for a watch face: apps.garmin.com Big font. Still some bugs but the dev is very responsive.
fazmo Jun 2021 1:28pm, 1 Jun 2021 138 posts	fazmo Just going back to the over measurement on a track - or other short circuit - can anyone please give me the science behind that? All that I can imagine is that if the garmin is accurate to within say 10m, then as you run the curve there will be more of that 10m radius circle on the outside of the track than the inside, so the joined up dots (that have landed randomly within the circle) will be on average further out than the track, despite some being inside and some outside. No idea if this is the reason, would love to hear the official line. And also a view whether the effect is defo real.
larkim Jun 2021 1:38pm, 1 Jun 2021 14,611 posts	larkim It's difficult to say without understanding how the watch / chip manufacturer codes any smoothing of the data into their capture of locations. As I understand things, a GPS receiver knows how accurate or inaccurate it's received data point is, but it doesn't "know" what the correct point is. So that could be forward, back, left, right of where the recorded point actually is. So that runs don't come out as zig zags all the time, I understand that there is some smoothing applied to the points to reflect the fact that the watch should really expect you to broadly progress in the same direction most of the time. It seems that this smoothing in general promotes a more likely recorded trace to be on the outside of the "real" curve than the inside as this is the less dramatic turning radius, which in turn would create a track that would measure a bit long. But then the straight lines between the data points can cut the corner too, which counteracts a little. My guess is that the corrections / smoothing are applied a little bit retrospectively building on the previous few data points to build a "sensible" trace. But that's a complete guess on my part!! I've had decent success with my watch measuring "ok" on tracks, despite only recording points every 2-3 seconds, sometimes less frequently. e.g. here I manually lapped (mostly) and you can see that most manual laps are coming out at 0.25m fetcheveryone.com/t-16246684 But the trace itself is far from perfectly describing the curve of the bend.
Sigh Jun 2021 1:09pm, 2 Jun 2021 9,440 posts	Sigh DCR review of the 945LTE is up: dcrainmaker.com Must admit I had no idea what LTE was before I read this, it's an interesting development but I'm not sure I'd want to pay monthly for it. Then again the connection with my Android phone is fine so I don't have an issue at the moment.
fazmo Jun 2021 1:43pm, 2 Jun 2021 139 posts	fazmo Cheers larkim that sounds like a possibility too.
chunkywizard Jun 2021 3:08pm, 2 Jun 2021 12,171 posts	chunkywizard New FR55 as well, which is a lower end watch with most of the features of the 245.
Dvorak Jun 2021 5:49pm, 2 Jun 2021 22,546 posts	Dvorak I've run a couple of times recently on what I am pretty sure is a 400m track (it is described as such and I have measured it as best as I can, but it is not a "track surface" marked track.) My Garmin (FR35) has measured it fairly consistently at around 385m a lap. Looking at the trace, it runs pretty consistently inside the curve. In fact. most things I run which are largely a circuit, the Garmin will run inside or cut corners. Quite annoying when your mile is really a mile and bit
azx Jun 2021 5:59pm, 2 Jun 2021 321 posts	azx I run round a gravel track though I use a stryd footpod. All my laps are 390 or 400m with more 400 than 390 and ending within 20m of 5000m. Never needed to calibrate it. It's a pretty neat device.
Oranj Jun 2021 7:57pm, 2 Jun 2021 2,662 posts	Oranj Your get better accuracy if you can set your Garmin to record at 1-sec intervals. The last few times I've done track intervals pressing the lap button at the end of 400m, they came out ever so slightly long which would concur with Larkim's theory above.
alpenrose Jun 2021 8:55pm, 2 Jun 2021 50,935 posts	alpenrose Just catching up on here, most of it over my head as I don't need to be so technical. Back to jelly, would clearing the history on your device improve the battery life for an extra long outing?