Just a word of warning to anyone who hasn't yet installed the COROS firmware updates, released on May 10 (V 3.0408.0) and May 21 (V 3.0409.0).

My recommendation would be not to update your firmware until COROS fix an issue that was introduced in V 3.0408.0 and affects the speeds recorded when in speedsurfing mode.

The issue mainly affects the max 2s and 10s results (reporting too low) but for anyone interested, full details are available on GitHub.

logiqx.github.io/gps-details/devices/coros/smoothing/

Has this error been addressed to GP3S or Coros? Is this something they are aware of and working on?

Yes, Michael shared all the info with us, and we have notified Coros about this, in the mean time don't hesitate to report this also to Coros directly, a bit of pressure is always good ->  https://support.coros.com/hc/en-150/requests/new

Update 31 May: The COROS product team are now aware of the issue. The timeline for resolution is not known, just yet.

Coros had identified the cause of this issue and they are going to fix it in the July 2024 Feature Update, the release schedule is below:

July 1st: Public Beta (Join with a link) 

• VERTIX 2, VERTIX 2S, PACE 3, APEX 2, APEX 2 Pro

July 15th: App Store Release

• VERTIX 2, VERTIX 2S, PACE 3, APEX 2, APEX 2 Pro

Thanks! Is Coros Apex Pro also involved and/or included in the update?

We can confirm that with the beta firmware the issues with the Vertix 2 and Apex 2 Pro series the issues reported are fixed. As far as we know Vertix 1 and Apex Pro series where not involved in this issue.