COROS ↔ Garmin Two-Way Data Sync: Complete Guide
Two Common Scenarios
Scenario 1: Switching Brands — Full History Migration
After three years with Garmin, you have hundreds of activities and VO2max history. Switching to COROS means opening the COROS App to find... nothing. COROS's EvoLab training analysis needs historical data to establish fitness baselines — without migration, you start from zero. The reverse is equally true going from COROS to Garmin.
GarSync batch-migrates your entire activity history (runs, rides, swims) from your old platform to your new one. With FIT device ID rewriting enabled, the migrated data is fully recognized by your new platform's training analysis system.
Scenario 2: Dual-Device — Daily Training Sync
Some users run a COROS watch alongside a Garmin bike computer — COROS for running, Garmin for cycling. Each device's data stays siloed in its own ecosystem.
GarSync sets up two-way sync between the platforms:
- COROS → Garmin: Push COROS running data to Garmin for training load calculation.
- Garmin → COROS: Push Garmin cycling data to COROS for unified analysis in EvoLab.
Both tasks run independently. Once configured, daily training syncs automatically with no manual steps.
Setup
- Add both COROS and Garmin accounts in GarSync's Account Management (OAuth one-tap auth supported).
- Create sync tasks: pick source and target, select "Sync Activities" and "Sync History" as needed.
- For full training analysis support, enable FIT Data Repair — device ID rewriting ensures migrated data is recognized by the target platform's training analysis.
FAQ
Q: Will two-way sync create duplicates?
A: No. GarSync's smart deduplication uses activity start timestamps as fingerprints. An activity synced from COROS to Garmin won't be re-synced back by the reverse task.
Q: Will migrated data contribute to COROS EvoLab analysis?
A: Yes. COROS EvoLab uses the complete activity data (heart rate, pace, power) to establish training baselines. The more complete your data, the more accurate the analysis.
Q: Are COROS and Garmin data formats compatible?
A: Both brands use the standard FIT file format for activity data. GarSync preserves all data fields during sync, making only necessary metadata adaptations (like device ID rewriting) — no sensor data is lost.