Bottom Time E-Mail News Archives 
July 2, 2013

We have had some great weather this last week and the lakes are warming up.  There have been three students that have completed their open water dives so far this summer. I need the rest of you to make an appointment to complete your open water dives.

We will have a scuba class starting in Staples on July 9 th and running Tuesday and Thursday for two weeks.  If you know of someone in that area that would like to become a diver let us know.

There is still have a lot of gear available for rent over the July 4 th weekend and it looks like the weather is suppose to be nice so let's get out and dive.

Remember we as divers need to do our part in preventing the spread of Zebra Mussels so make sure that your gear is cleaned off and dried before diving in another lake especially if diving in invested waters.

Scuba tip of the week:
Recreational diving is still a relatively young sport. Created in the 1950s, it gained acceptance in the '60s and '70s, boomed in the '80s and took great technological leaps in the '90s. So there's a good chance that not everything you learned in your open-water class still applies. New research and equipment have made diving safer and more enjoyable than ever—if you know the new rules.
1. Reverse Dive Profiles Are OK
New Rule
It is permissible to dive deeper on your second dive than on your first, and to dive deeper on the later part of a dive than on the early part.
Old Rule
Most divers have been taught to go to their greatest planned depth early in the dive and then gradually work upward in a regular "stair-step" pattern. Similarly, they've been told to make the deepest dive of the day the first one. The rationale was that the shallower depths later provided decompression for the preceding greater depths.
Reason for the Change
Dive computers. Because computers can track your depth and time constantly and are pretty good at math, it's possible to know your nitrogen exposure accurately regardless of your profile. Tables, by contrast, can account for only your greatest depth, and this crude approximation of nitrogen exposure still mandates a conservative approach.
Exceptions to the Rule
Obviously, divers using only tables must still follow the old rules. And even when using a computer it's still smart to dive deeper first. Ascending profiles give you more bottom time and a greater margin of safety against DCS.


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