**Dive
Log Books**

A log book keeps information about each and every dive that I have made. To view the log books just click on the log book below you wish to view.

For an explanation of the information found in the log book please look at the bottom of this page

**An Explanation of my Dive
log Book, using Dive 290 as an example (See image below)**

The screen shots found on these pages are taken from my pc running specialised software called Data Track. This software down loads the data stored on my dive computer (Uwatec Aladin Pro - Air) via a clever little device called a memo mouse.

On the left hand side there is a summary of the dive. Some of it I enter (Location Site, Air consumption, buddies etc.) Most of it is self explanatory however the Air consumption needs a little explaining.

To find out how much air I have consumed in one dive the following calculation is made. The tank size is multiplied by the Air consumption in bar (in the case of dive 290 this is 15L x 150 = 2250 litres of air.) 2250 Litres of air is based at the surface. However the air becomes more, dense at depth at 10 meters 2250 becomes 1175 litres. At 20 metres this becomes 587 litres. At 30 metres this becomes 293 litres, and at 40 metres this becomes 146 litres.

The average person at the surface will consume at rest 20 litres of air per minute. An average 15l cylinder is normally filled to 220bar = 3300 bar which means at 30metres I can spend max would be about 18 minutes (and this would be tight on safety margin).

The right hand side graph shows the depth graph over time, you can usually see obstacles in the water by the shape of the line, in the case of dive 290 between 10 and 16 minutes this was a Helicopter. This graph also provides on average my air consumption in litres per minute. Also the min no stop time is the time I had at a particular depth before I started hitting decompression stops. It is usual however in a dive that I would spend normally 3 minutes at 5m before I surface this is known as a safety stop.