Tbf, I do swim OW once a week once it’s warmed up
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ie one week in august, before it gets too cold again
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Come on. End of April until mid September usually!
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How do you find Garmin’s race predictions?
Last year I used COROS and the 5/10k predictions were pretty close to my expectations (pretty much 18:00 & 37:45), I didn’t race anything longer, but the relatively slow marathon prediction of 3:30 was pretty fair!
Since very early Jan I switched to a Garmin 255 and I’m really not that impressed. In the last 3 parkruns I’ve done a 18:55, 18:15 and today was an easier 20:11 (ave HR about 15 below the previous weeks and max HR 10 lower).
All 3 were recorded over 5km, the more accurate GPS was a big driver for the switch.
Garmin’s 5k prediction was 19:17 last week and today it’s 19:42, so it seems garbage!
I guess to be fair I’ve not raced anything over 5km this year, whereas last year with the COROS I did a few 10km.
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Crap.
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And so we have the 255 use case and 55 use case defined 
Well done TT!
Anyone else seeing odd measurements on the Opticsl HR when at rest? Noticed earlier it said my HR was 37, I checked my pulse and it was double that.
Noticed a few dips when looking in the app where it momentarily thinks its really low. Only seems to have started recently.
Mine has been fine, albeit it’s only a fortnight old.
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Haha, although I’ll admit I’m a bit crap I still wouldn’t class it as at rest 
I think that was massively over-reading from what I remember?
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Speedy swimmer humblebrag…
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Like sneaking a trotter shot in
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It’s a bit cheeky, not on mine but they’ve probably twigged I’ve got the 965.
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Bought a 255 from a fairly ropey looking site called Start Fitness. They had an Easter code for 25% off, so £233
Paid by CC just in case 
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I’ve ordered heavily discounted clothing items from them before, all good
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They’re a fairly well established retailer, got a big shop in Newcastle and then moved into mail order.
Do a lot of their own brand stuff called more mile, cheap and cheerful.
Conclusion is that you should be alright!
Edit: their website was always a bit naff
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Did check and saw they had an address in Newcastle but like you say their website looks basic!
Your fucked.
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