After through testing and investigation, we have discovered that having the barometer-thermometer (a combined electronic part) powered on during exposure to chlorine dramatically accelerates the failure of the part. “The ability to measure water temperature readings during a pool swim activity was removed in version 7.80. And a short bit later, one of the Garmin customer support folks posted the reason why this was removed: And as usual, all broken roads lead to the Garmin Forums, where they posted their lack of fishbowl weather recording capabilities near immediately. Turns out though, despite not being listed, someone did notice this change. It’ll however continue to do so in an openwater swim. But as of that firmware version, the FR945 will no longer gather temperature data during a pool swim. In most cases, you’d probably never have noticed unless I mentioned it. Now – I didn’t say that it was a significant change to consumers. However, behind that curtain of mundane was actually a significant technical and customer support change that wasn’t oddly listed (in my mind, it should have been): Disabling the watch from gathering temperature data during a pool swim. Updates can be installed through Garmin Express or the Garmin Connect Mobile app. Fix a barometer issue that could lead to inaccurate elevation.“Forerunner 945 – System Software version 7.80 Change Log The release notes only contained a handful of items, none of which appeared to be even glance-worthy. On paper, firmware update 7.80 was about as boring as they get. Back in August Garmin released a minor firmware update for the Forerunner 945 multisport GPS watch.

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