mistressmotorsports
Contributor
Hi all, I have an interesting problem to ask of you all.
I have been diving for quite some time with a Manta on my wrist and an XR1 Nx in my console as a backup. For many dives, these two computers have been tracking right with each other relative to NDT, depth, everything. I am (was) pretty sure they use the same algorithm, as even on multiple dive days, they tend to track pretty closely together. Today I had a wierd occurrence. After 2 dives yesterday and a 22 hour S.I. before diving today, both computers were clear and showed no desat time remaining.
The following was then done on air today: I did one roughly square dive to 66 feet for 52 minutes, including the ascent and safety stop. There was a 51 minute S.I. then another dive to 59 feet max, with the bulk of the dive at 50 feet. About 35 minutes in, the XR1 goes into deco and tells me to ascend to a 10 foot ceiling for 1 minute. The other computer showed 24 minutes of NDT remaining at the time of the warning on the XR1. Of course I ascended at a normal rate, and the warning cleared even before the safety stop began. I did a 5 minute stop at 18 feet, then surfaced. At the end of the dive, both computers showed the same desat time. I checked that all the settings were the same on both computers, including the mix set on air, all the warnings that could be set were the same, etc.
I am wondering why I got such differences between two computers that were always close before. I have done three and even 4 dives on the same day with these two computers, and I never had them deviate this far. Any ideas what may be going on? I expect some deviation just because the units are on different parts of my body, but they always read within a foot of each other and track really closely.
Thanks for any ideas.
Mike
I have been diving for quite some time with a Manta on my wrist and an XR1 Nx in my console as a backup. For many dives, these two computers have been tracking right with each other relative to NDT, depth, everything. I am (was) pretty sure they use the same algorithm, as even on multiple dive days, they tend to track pretty closely together. Today I had a wierd occurrence. After 2 dives yesterday and a 22 hour S.I. before diving today, both computers were clear and showed no desat time remaining.
The following was then done on air today: I did one roughly square dive to 66 feet for 52 minutes, including the ascent and safety stop. There was a 51 minute S.I. then another dive to 59 feet max, with the bulk of the dive at 50 feet. About 35 minutes in, the XR1 goes into deco and tells me to ascend to a 10 foot ceiling for 1 minute. The other computer showed 24 minutes of NDT remaining at the time of the warning on the XR1. Of course I ascended at a normal rate, and the warning cleared even before the safety stop began. I did a 5 minute stop at 18 feet, then surfaced. At the end of the dive, both computers showed the same desat time. I checked that all the settings were the same on both computers, including the mix set on air, all the warnings that could be set were the same, etc.
I am wondering why I got such differences between two computers that were always close before. I have done three and even 4 dives on the same day with these two computers, and I never had them deviate this far. Any ideas what may be going on? I expect some deviation just because the units are on different parts of my body, but they always read within a foot of each other and track really closely.
Thanks for any ideas.
Mike
