My RDB and I both have Oceanic primary and secondary computers and usually run DSAT. I have an OC1 and she uses a VT4. We do this on purpose so that we are relatively closely in line with NDLs. This has worked extremely well up until yesterday. We were on the last of a series of dives over the weekend and the fourth of the day. We were using 32% nitrox, planning on a dive to 80-90 feet, and just before the dive we were looking at our NDLs in planning mode and everything looked good for the profile we intended to do. The dive went very well -- just as planned-- right until near the end. I was still showing about 16 minutes of ND time and we were casually making our way towards the ascent line when my RDB signals that she only has 4 minutes left and that it is time to start our ascent. This was quite surprising to me because if anything I was diving the slightly more aggressive profile. Of course, no time do debate or second guess at depth. We did our ascent and all was fine.
So, I downloaded our dive profiles and everything was as remembered and, indeed, her VT4 was showing 4 minutes at the point in the dive when my OC1 was still showing 16. This is a big difference in my mind given how closely our dive profiles matched. Any ideas about what is going on here? I don't have them with me now, but one thing I thought of was that maybe she had the conservative factor on, but looking at the algorithm, I can't see it making such a huge difference. I am going to more carefully look at our profiles tonight for all four dives, but I would be shocked to see anything there that would cause such a discrepancy. Plus, in planning mode before the dive everything looked very similar.
Anyone have any ideas what might be going on here? I'm really curious.
Thanks for the replies.
So, I downloaded our dive profiles and everything was as remembered and, indeed, her VT4 was showing 4 minutes at the point in the dive when my OC1 was still showing 16. This is a big difference in my mind given how closely our dive profiles matched. Any ideas about what is going on here? I don't have them with me now, but one thing I thought of was that maybe she had the conservative factor on, but looking at the algorithm, I can't see it making such a huge difference. I am going to more carefully look at our profiles tonight for all four dives, but I would be shocked to see anything there that would cause such a discrepancy. Plus, in planning mode before the dive everything looked very similar.
Anyone have any ideas what might be going on here? I'm really curious.
Thanks for the replies.
