The D3 is ok. Sometimes you can't hear the alarm, buttons are not easy to press, and sometimes the time and date will just reset itself. None the less it is still a great tool.
For apena I use a regular stop watch. The timer up on the D3 is hard to read.
Here is the results from a ATRC test search. After my test I was light headed but did not bo.
Dive safe,
Jay
