<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Alberto,<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 27. Jul 2021, at 10:32, tormento via subsurface <<a href="mailto:subsurface@subsurface-divelog.org" class="">subsurface@subsurface-divelog.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta charset="UTF-8" class=""><div class="gmail_default" style="caret-color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: georgia, serif;">Shearwater has introduced DCIEM decompression model on its models.</div><div class="gmail_default" style="caret-color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: georgia, serif;"><br class=""></div><div class="gmail_default" style="caret-color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: georgia, serif;">Would it be possible to have it in Subsurface to allow pre dive calculation?</div><br class="Apple-interchange-newline"></div></blockquote></div><br class=""><div class="">as far as I can tell this model is published in terms of tables, for example here </div><div class=""><br class=""></div><div class=""><a href="https://www.divetable.info/manuals_4_free/p125936.pdf" class="">https://www.divetable.info/manuals_4_free/p125936.pdf</a></div><div class=""><br class=""></div><div class="">and I read the presse release of Shearwater <a href="https://www.shearwater.com/dciem/" class="">https://www.shearwater.com/dciem/</a> as they have a closed collaboration with DCIEM to bring this model into dive computers but I could not find any public documentation of this model. </div><div class=""><br class=""></div><div class="">There is some info here</div><div class=""><br class=""></div><div class=""><a href="https://cradpdf.drdc-rddc.gc.ca/PDFS/unc33/p511493.pdf" class="">https://cradpdf.drdc-rddc.gc.ca/PDFS/unc33/p511493.pdf</a></div><div class=""><br class=""></div><div class="">but nothing on specific model parameters and even more important: nothing about the ascent criterium.</div><div class=""><br class=""></div><div class="">Correct me if I am wrong, but it seems to me the use of the DCIEM tables/model is mainly to fulfil legal requirements for commercial divers, mainly in Canada. </div><div class=""><br class=""></div><div class="">And unless there is an actual documented model to implement, I don’t see much bonus in implementing tables in Subsurface. If you want to plan your dive with a table, you can directly use the table rather than having a program read the table for you (you don’t get additional information).</div><div class=""><br class=""></div><div class="">I don’t know if this is the case for Shearwater, but my guess would be that they treat their interpretation of the model as a trade secret so they have an advantage over their competitors in terms of being the only brand that the above mentioned Canadian commercial diver can use to fulfil her legal duties. Which means, we have no chance in Subsurface implementing anything that could predict the schedules that their computers compute in DCIEM mode.</div><div class=""><br class=""></div><div class="">But all this is based on a short Google search. If you have any additional information on the model, I would love to learn about it.</div><div class=""><br class=""></div><div class="">Best</div><div class="">Robert</div></body></html>