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Offline-First: What It Actually Means for Divers
"Offline-first" isn't a marketing term for us. It's an architecture decision. Here's what it means when you're on a liveaboard with no signal.
No login required. Ever.
Open the app, pick your mode, dive. There's no authentication server to reach, no token to refresh, no 'please connect to continue' screen. The Watch app initializes from local data. Period.
Data is written locally during the dive
Depth samples, temperature readings, timestamps — all written to persistent storage on the Watch at 1 Hz. If the Watch battery dies mid-dive, data recorded up to that point is preserved. No upload queue, no sync buffer. Just local writes.
Sync happens over Bluetooth, not internet
After the dive, data transfers from Watch to iPhone via Bluetooth. This works on a boat, in a van, in a cave entrance — anywhere your iPhone is within range. No WiFi hotspot needed. No cellular signal needed.
Export works without internet too
Generate a CSV file on your iPhone without any network connection. Share it later when you have connectivity, or AirDrop it to a buddy's phone right there on the boat. The file is created and stored locally first, shared on your terms.