Several COROS firmware releases during 2024 have been problematic for the speedsurfing community. This page captures the various issues, listing the 2024 firmware releases in reverse-chronological order.
Prior to reviewing the details on this page it is advisable to read the article about sampling rates and aliasing. It would also be beneficial to read the article comparing the windsurfing and speedsurfing activities on COROS watches.
There have been four distinct behaviors for speedsurfing activities during 2024:
The official COROS release notes do not mention any of the changes in behavior:
The beta release 3.0706.0 appears to fix the issues between May and Aug 2024.
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 / 2S | |
|---|---|---|---|---|---|
| 3.0706.0 beta | - | - | 2024-09-13 | 2024-09-13 | 2024-09-13 |
The 3.05xx.0 releases exhibit issues because speedsurfing behaves much like windsurfing, which is non-doppler and thus prone to spikes.
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 / 2S | |
|---|---|---|---|---|---|
| 3.0510.0 | - | - | 2024-08-02 | 2024-08-02 | 2024-08-02 |
| 3.0508.0 | 2024-08-07 | 2024-08-07 | 2024-07-15 | 2024-07-15 | 2024-07-15 |
| 3.0506.0 beta | - | - | 2024-07-01 | 2024-07-01 | 2024-07-01 |
The 3.04xx.0 releases exhibit major smoothing issues on Airoha watches (APEX 2, APEX 2 Pro, VERTIX 2), reminiscent of Garmin watches in 2022.
The smoothing issues do not affect the Sony watches (APEX Pro, VERTIX).
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 / 2S | |
|---|---|---|---|---|---|
| 3.0409.0 | 2024-06-06 | 2024-06-06 | 2024-05-21 | 2024-05-21 | 2024-05-21 |
| 3.0408.0 | - | - | 2024-05-10 | 2024-05-10 | 2024-05-10 |
The 3.03xx.0 releases exhibit the original behavior, similar in many respects to the Garmin watches in 2024.
However, unique to the COROS is the temporal offset issue on the APEX 2, APEX 2 Pro, VERTIX 2 which causes fantasy alphas.
| APEX Pro | VERTIX | APEX 2 | APEX 2 Pro | VERTIX 2 | |
|---|---|---|---|---|---|
| 3.0309.0 | 2024-01-31 | 2024-01-31 | - | - | - |
| 3.0308.0 | - | - | 2024-01-31 | 2024-01-31 | 2024-01-31 |