Choosing to keep a written logbook or not does not need to be such a divisive issue.
It's purely a personal choice, and I hope we can all just agree on that.
I have written at length in other threads about how much I cherish my logbooks.
To me they represent my history, my passion, my time, and my love of diving.
I have carefully logged over 1,700 dives over twenty+ years.
That said, the truth is...
Nobody gives a damn about your logbooks but you.
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Clearly the OP is looking for advise about methods to rescue lost dive info.
In addition to the suggestions already offered...
- Think in terms of what info validates a logged dive? Location, date, duration of dive, maximum depth. Secondary info can be reconstructed later, or not.
- Do you or your buddies have any digital photos from the dives? Most digital cameras will date and time stamp the digital files.
- Can you remember making any phone calls or sending texts or emails the day of a dive? You may be able to distill some time, date, and location data from records.
- Once you know the time and date of your dives, perhaps your buddies, or dive operation, can fill in some more details for you.
- The suggestions above cover the technical info about a dive. Perhaps after recreating the frame work of your lost dives, some of the experiences will return to your memory. Interpretive things like the weather and sea conditions, the sea life observed, and your impressions of the day.
I have used these methods in the past to refine my log entries.
And one tip: Leave your log book at home. Use a dive slate or a school notebook to record info when you dive or travel. Update your real logbook when you get home.
K