THE DIVE LOG
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The scuba diving log book is a very valuable document. It should be treated as a diary of diving activities. It provides the following beneficial information:
Log every dive. Fill in all the data requested. It will be to your great advantage.
The following are two pages from the Deep-Six dive logbook. The entries are explained below the log pages.
Dive Number: Sequential starting with your 1st open-water dive during your certification course
Location: Such as Lake Mohonk, or West Palm Beach on the wreck, Princess Ann, etc.
Date: The date the dive was done
Dive Buddy: One or more people that have committed to be with you during the dive.
# (Catastrophe) is the total number of divers that were on the dive
Temp (Sur/Btm); The recorded temperature found at the surface and at the deepest depth.
Visibility: How far you can see horizontally during the dive (it may vary)
Suit/Wts: The physical description of the suit you wore (size, thickness, etc.) and the amount of weight needed.
Notes: Here you should record any experiences, observations, new equipment, training, etc.
SI: This is your surface time spent degassing between dives (hours:minutes)
Rep Grp: The new Repetitive Group (A-Z) after degassing between dives.
Tank Pressure Start: Using the Submersible Pressure Gauge (SPG), read the tank pressure before entering the water. Record that number here.
Tank Pressure End: Using the Submersible Pressure Gauge (SPG), read the tank pressure after leaving the water and then record that number here.
Total Hrs To Date: The number of hours spent in the water - The number comes from the previous logged dive.
Hours this Dive: The number of hours and minutes from the time of entering the water to the time of exit.
Total Water Hours: Add the Hrs to Date and Hrs this Dive and put the total here. Also that number goes on the next log page under Hrs to Date. The time accumulates for your entire diving career
Start: Put the time you entered the water before and after the colon, such as 13:23. Use Universal Time
End: Put the time before and after the colon, such as 17:05, for when you leave the water. Use Universal Time
Depth Max: The maximum depth you reached (from the computer, or Maximum Depth Indicator on the depth gauge)
Bottom: From the time you submerged until surfacing. Surface time does not count. Read this number from the computer or watch. It's in minutes.
RNT: (Residual Nitrogen Time) If you had a previous dive, put the RNT here. This has to be figured from the decompression table.
ADT: (Actual Dive Time) This, again, is the bottom time.
TDT: (Total Dive Time) Add the RNT and the ADT and put that total here.
Letter Group: Use the TDT and the maximum depth to figure your ending Repetitive Group from the decompression table. Put that letter in this box
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