Apple Watch Ultra dive log: from Apple Health to a logbook

What Loggerfish reads

Loggerfish reads the diving workouts in Apple Health. For each dive it takes the date, the start time and the length, the maximum and average depth, and the water temperature, where Health has them. It asks for permission to read workouts, depth and water temperature. It writes to Apple Health only if you switch on *Save to Apple Health* in Settings; it is off until you turn it on.

What you need

• The iPhone app. Apple Health can only be read on the iPhone; the web app at app.loggerfish.com cannot.
• iOS 17 or later. On an older phone the Health button does not appear.
• Dives recorded with the Depth app or Oceanic+. These are the two apps the Loggerfish import screen names.

Reading dives from Health is free, as is the dive computer download.

Step by step

1. Open the Loggerfish iPhone app.
2. Open the import. Under Apple Health, press “Read dives from Health”.
3. Allow access when iOS asks.
4. Read the preview. It counts the dives that are new, the ones already in your log and the ones that differ. Nothing is saved yet.
5. Press Import.

There is also a short page with the same steps.

What does not come across

Health hands over one maximum and one average depth per dive, not the depth profile, and no gases or cylinders. It has no site names either. A dive that matches one already in your log takes that dive's site; any other comes in without a site, and you add it afterwards. Sessions shorter than five minutes are left out as breath-hold rather than scuba, and the preview says how many.

If it finds nothing

iOS does not tell an app whether you refused access or simply have no dives, so Loggerfish cannot say which it is. If you know you have dives, open Settings › Health and check that Loggerfish is allowed.

Keep a copy you control

Once the dives are in Loggerfish you can export them as Excel, as UDDF for other logbook programs, or as a full backup, all free on every plan. To add the details a watch does not record, such as buddy, gas and notes, open the dive. The guide to logging a dive says what is worth adding.