BUG: Pool swim laps incorrect and inconsistent between watch and app (TrainingPeaks and Suunto Guides structured workouts)

Manuel Extreme

[Suunto Vertical 2 - 2.53.43] Pool swim laps incorrect and inconsistent between watch and app (TrainingPeaks and Suunto Guides structured workouts)

Description
During pool swimming activities with structured workouts (TrainingPeaks and Suunto Guides), the laps detected by the device are incorrect. Lap distance and duration are inconsistent and do not match the actual intervals performed. Additionally, lap data shown on the watch differs from the data displayed in the Suunto App.

Reproducible steps (if applicable)

Start a pool swimming activity
Load a structured workout (TrainingPeaks or Suunto Guides)
Perform the workout including freestyle and drills, with automatic intervals and manual stops
Save the activity and review lap data on the watch and in the Suunto App

Expected result
Laps should match the structured workout intervals, with correct distance and timing, and consistent data between watch and app.

Actual result
Laps have incorrect distance and duration and do not correspond to the actual intervals performed. Data differs between watch and Suunto App.

Context (if not reproducible)
N/A

Additional details

Suunto App version: iOS 3.9.0 (22101)
SuuntoPlus Apps: Swim Timer
Watch face: N/A
Activity type: pool swimming (25m pool)
Frequency: always

Attachments

Activity link: N/A
FIT file: YES
GPX file: N/A
Media: foto

Logs
Logs 2026-04-09 10:45 (UTC+2)

Notes
Issue observed since January 2026.

69d74f3e995526132e125c60.fit

isazi

@Manuel-Extreme thanks, very detailed

isazi

Reported to Suunto. @manuel-extreme can you send me your email in private (for the logs)?

emkei

I still dont get how this is possible. Maybe I am wrong, but I thought that the device, watch (not only Suunto) works as the recorder of data, and those are moved to app for further processing. The more sofisticated calculation happens in the app, and basic ones on the device and/or app using the same algorithm.

Why other brands do not experience these issues?