Garmin Fenix cannot replace a phone, but has better battery life. The Apple Watch Ultra can do most of the things you'd need your iPhone for out on a trip. If

Garmin Fenix cannot replace a phone, but has better battery life. The Apple Watch Ultra can do most of the things you'd need your iPhone for out on a trip. If you are really UL, you can ditch the phone and just use the Ultra. Apple Watch + small battery is lighter than a Fenix + iPhone + battery.