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Ooh, had missed the OH1, that looks good (as I'd prefer something that clips on to the goggle strap rather than a chest strap for swimming).
For general running I just use the wrist sensor on my 935, it's mostly ok for running (but really struggles with big swings in HR that happen during 5-a-side). Also don't get running dynamics stuff (not that I care about it that much) with wrist or OH1 - I'd need a running dynamics pod clipped somewhere to do that. If I need to wear the OH1 and a running dynamics pod I may as well just wear my HRM-Tri strap.
Looks like a bit of a faff to get the HR synced with a swim activity if using a Garmin (and not using the Polar stuff) but I'm up for a challenge.
Will add the OH1+ to my "possible" list, although I'd much prefer it to support ANTfs so that my 935 can download the HR from it post-swim, rather than having to faff around with it at a later date. Will hold out in case they add that to a newer/future model.
@nefarious
Another option is Polar OH1. I don't really like chest straps - feel constricted a bit when running. The arm straps seem to be far more reliable than the wrist ones despite both being optical. I have a Garmin
945935 and I've just disabled the wrist sensor since getting the polar.Less movement, less affected by sweat, and fleshy of your arm is a better place to record or something.
OH1 also includes a clip to attach to goggles which I haven't used myself but it's an option.
I definitely prefer it for bike and run though.
Obligatory DCR link - https://www.dcrainmaker.com/2019/03/polar-oh1-plus-optical-hr-sensor-in-depth-review.html