One area where my Apple Watch 4 is not so good is pool swimming (and open swimming, but that's another topic).
It's tracking weird HR data. I don't need it, but seeing something like 210 average HR for a 45-minute swim is strange. I tried to tighten my watch band like hell and keep it two to three thumbs from the wrist bone (carpal bones?) — the results were the same. Probably, the following AW models and Ultra are much better. And a sensor screen is not so good for multiple intervals (I didn't check how the Action button in Ultra works). But pool tracking (if saying about distance, strokes, etc.) is excellent.
So, I use Garmin (FR955) — very convenient because of the physical buttons and very readable display. Periodically, I check the distance when gliding after a turn.
But sometimes it drives me crazy. For example, I need to overtake a few swimmers on busy days. I slightly changed the stroke rate or slowed down for two to three seconds.
Garmin knows everything about my average speed, pool length, average speed, strokes per pool, etc. Let's say I use 35 strokes of freestyle per 50m pool. What is Garmins' "science" said? Yep, "you changed your speed — our congratulations; you have finished 50m in 10 strokes."
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There are two errors in this session — 1-2 and 5-6. It's 2x50m, but Garmin thinks 4x50m.
As a result, instead of 1200m, Garmin tracked 1300m and congratulated me with my new Personal Best.
This is not so frequent, but pretty common scenario. One out of five swims contains this issue. Yeah, I know how to fix this issue and use swimmingwatchtools.com for corrections.
But it's bizarre to see these errors in Garmin and I am considering purchasing AW9 (or UW2) to fix this.