M430 memory storage and notifications
M430 has an 8 MB memory. It can store up to 60 hours of training with GPS and heart rate, depending on your language settings.
When M430 memory is low, the device informs you with memory low notifications. After receiving a notification, it is recommended to sync your M430 with the Flow web service or Flow app.
1 h of memory left. Oldest session(s) will be overwritten: Your oldest session will be overwritten when the memory becomes full.
Memory low. Please sync M430 with flow.polar.com: Sync M430 with the Flow web service or Flow app to make sure your oldest training data is not lost when the memory becomes full.