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If you look at an actual log book given to beginning divers, you will see that the dive time portion is set up to use for planning dives using tables. It has a place to put in the bottom time and a place for the ascent/safety stop. The bottom time, not the total time, was the time you used to plan your next dive. The bottom time, not the total time, told you your pressure group at the end of the dive. You would than use your surface interval to calculate your allowed bottom time (not total time) for the next dive.
I may have suggested way back in the thread to not take a paper log book on a boat or near the water. Keep it in the car, etc. and take a sheet of paper & pencil to the boat/beach and put in a water proof jar.
Agree on all points. It's still early in the thread though. For some reason the "What should I log?" topic tends to draw a crowd each time. Case in point, my post now.With this thread about to go on its 9th page I'd probably be beating the dead horse, but here are my two cents. I will log all dives I make except the pool dives. My reasoning is: if the number of dives is an indicator of experience, then travelling to a dive site, assembling and checking the gear, choosing the correct amount of lead, making an entry/exit in real-life conditions, descending/ascending, disassembling and packing the gear gives you as much experience on a gear-test dive as any other dive. Maybe more, considering that most gear-test dives are shore dives, so they pose more entry/exit challenges than boat dives.
I don't think parameters such as depth, bottom time, conditions, etc. have any bearing on whether to log a dive or not. I think any scenarios where a simple number of dives is a prerequisite (such as 100 dives for a PADI Dive master I believe) look as much at what happens outside of the water as what happens during the wet portion of the dive. Same with the date of the most recent dive - a dive operator would be more interested in when was the last time a prospective client had a chance to go through a full cycle, rather than how deep of how long their dive was, or what was the purpose of it.