Decompression Macro
In an attempt to learn more about decompression theory, I decided to use the information from DIY DECO and abyss software and write my own macro to perform the decompression algorithms.
The macro is based upon the Bühlmann ZH-
I chose to have the decompression stops at a minimum of 6m similar to the BSAC ’88 tables, and then in 3m intervals for the deeper stops. The macro can only handle the first dive of the day, and is reinitialised for the next dive. Any tissue loadings from the first dive are lost.
The macro may contain errors, and should not be used for dive planning of any sort. If you are interested in seeing the macro, it can be download here. However, the author accepts no responsibility for errors contained in this file, or injuries or illness arising from the use of this macro in any way. In downloading this file you agree to these terms.
Also, there are much better freeware and shareware decompression programs already available on the internet.
After writing this macro, in an attempt to debug or test the program I compared the results with the BSAC 1988 tables, the DECO2000 tables, and the PADI tables.
The macro shows about 3 or 4 times the amount of decompression required by the BSAC tables, and about 4 times less no stop time. However, the no stop limits compare well to the PADI tables. The decompression durations are within a few minutes of the DECO2000 tables.
It is felt that these differences may be due to different models being used for implementing the plans. The PADI and DECO2000 tables may be based on the Bühlmann model, and the BSAC tables based on another model, perhaps the RNPL tables (TBC), which would explain the differences between the deco times. I tried to find out what the BSAC model is based upon by doing a quick web search but was unable to find out. If anyone knows, please feel free to drop me an email.
Improvements
Since version 1 I have added the capability to include a surface interval, and plan a second dive. Version 2 can be down loaded here. The same disclaimer applies.
Version 3 can be down loaded here. This version uses forms to enter and read the data. The same disclaimer applies.
Extra Stuff
I have created a gas consumption calculator for the HP jornada 540 (SH3 processor). You can down load it here. The same disclaimer applies.