Help Me to Understand Data from Dive Computer

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Ryan Neely

Contributor
Messages
204
Reaction score
107
Location
Akeley, MN USA
# of dives
100 - 199
So, I have a couple of dives under my belt with my Oceanic Pro Plus 4.0. Three to be precise. I'm struggling to understand the data the computer transfers to the DiverLog+ app. When scrubbing my finger across the graph at the top, I can see that the total "dive" was approximately 38 minutes. It shows me on the surface from 8 to 12 minutes (my marker buoy broke free and I had to go after it). However, the data shows "Elapsed Dive Time" at 21 minutes and "Surface Interval" at 43 minutes. It is possible that the dive time after recovering my marker buoy could have been 21 minutes, but where on earth is that surface interval coming from?

Does anyone have experience with this sort of thing? I can't find any information in the Pro Plus 4.0's manual.

 
Looks like your time at surface was brief enough for the log to consider it one dive.
Surface interval is almost certainly the time between ending the previous dive and the start time for this dive. Same use of terms as when using dive planner tables.
 
That would have been my assumption. My confusion stems from the almost 96 hours between this dive and the previous dive. The surface interval on this dive was only 4 minutes ... long enough to recover my marker buoy ... so I'm not sure where that 43 minutes comes in.

Also, if the 4 minutes it took to recover the buoy was short enough to count as a single dive, then where does the 21 minites Elapsed Dive Time come from? That's where my confusion lies.
 
Looks like your time at surface was brief enough for the log to consider it one dive.
I agree. If the entire dive was 38 mins, then the first and last segments were about 15 mins each, and the surfacing in the middle was about 8 mins. That 8 mins is not considered as a second dive.

The 43 min SI should have been from the end of dive number 5 to the start of this dive number 6. You say that is not possible. The 21 min elapsed dive time might mean total dive time to date, but I doubt it. Is there a manual for the diverlog+ software?
 
Dive 6 clearly consists of two segments run together. Elapsed Dive time should be the combined total of those two segments, as apposed to the difference between the start and the end time.
Less easy to explain why you don’t understand the surface interval. But you say you have 3 dives on the computer, and this is dive 6 in the log. Do you have some more disjointed segments that WERE long enough between to log as separate dives? Scroll back and note the dive start times.
 
Hey, guys! Thanks for trying to help with this. @tursiops, there is a "How To" for the DiverLog app, but it is more of a walk through for initial setup. I do have a call out to their tech department, but getting any real response has been ... difficult.

@JackD342, for clarification, I understand what a surface interval is, I just can't wrap my head around this particular number.

To help illustrate, the three dives I have on this computer are #4, #5, and #6. (#1, #2, and #3 were prior to buying the computer and were dived using gauges). Dive #5 took place on Thursday, May 23rd and ended at 7:30 p.m. This dive, dive #5, began on Monday, May 27th at 3:30 p.m. This is far more than the 41 minutes the software suggests.

I can't illustrate it here, but you can scrub your finger along that graph. Doing so shows you depth at a specific time interval. For example, on the attached graph, the start of that brief moment I spent on the surface to fix my float was at the 8 minute mark. The end of that brief surface interval just befpre descending again is at the 12 minute mark. The very end of the dive, just at the tip of that final descent, is indicated by 38 minutes. However, the 23 minute Elapsed Dive Time seems more accurate for the actual dive time.

Now, to be fair, I didn't look at a watch prior to initial descent. (My buddy and I knew we weren't going deep and had set an air consumption limit, rather than a time limit.) Perhaps next time I will pay closer attention to ingress and egress times.
 
Something is really screwy about that graph. If the full duration of the dive is 38 Mins, from the left mark to the right mark, then no way is the break in the middle just 4 mins. It scales to 8 mins, and each segment before and after scale to about 15 mins each.....adding to 38. So elapsed dive time (i.e., time underwater) would be 30 mins, not 23.
 
Something is not adding up. 38 minute mark for end of dive, less 4 minutes spent at surface, does not come close to 21 for dive time.
I suppose one possible interpretation of the 43 minute surface interval is that was the time between booting it up for the dive and starting the dive, but I think that would be unusual.
Also possible there is some glitch to work out with a future firmware release. This is a very new model, right?
 
Do you have the software also loaded to view on a desktop, in case the issue is with the rendering in the mobile app? Also, did you do any firmware updates somewhere along the line?
 
Something is not adding up. 38 minute mark for end of dive, less 4 minutes spent at surface, does not come close to 21 for dive time.
I suppose one possible interpretation of the 43 minute surface interval is that was the time between booting it up for the dive and starting the dive, but I think that would be unusual.
Also possible there is some glitch to work out with a future firmware release. This is a very new model, right?
I'm guessing the problem is in the software app. The website for that app does list his computer as being compatible, however.
upload_2019-5-28_11-15-49.png
 
https://www.shearwater.com/products/peregrine/

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