Fly marked as a dive

[emoreira]

Last weekend I did several dives.
The last dive (dive #7) was done on Sunday, it was a 44 minutes dive at a max depth of 7 meters. The dive ended at 6:32 PM. The following day, Monday, at 3:33 PM, the fly back home was reaching altitude and cabin decompressed.
The PDC was with me in the cabin.
Back at home, I was downloading the PDC log and I was surprised to see that it showed an 8th dive done at a depth of 2.4 meters, exactly 21:01 hours of Surface Interval, and a duration of 9:-- hours, min water temp of 13 °C
The PDC is an Oceanic VEO 180NX
I don't know if the PDC was showing the H2O sign, meaning that the contacts were still wet.

I was reading the PDC Manual. Perhaps the two minus signs are a reference to a No fly time violation. The manual is not clear with regard to the no fly time violation.

Any better explanation ?

 

[runsongas]

sounds like it activated at some point during the flight at cruising altitude and decided you were at altitude. then your descent back to sea level was counted as a dive. the math checks about right for a cabin pressure around 7400 ft.

 

[jmb122mp]

My first Oceanic Pro Plus 3 did something similar. After 2 morning dives I was taking a nap in the afternoon. The PP3 activated in my hotel room, thought it was doing an altitude dive, and after the maximum dive time (exactly x hours, don't remember the exact number) it ended the dive and reset my dive number to 0 (2 morning dives still in the logs and less than 24 hours, dive number should have been 2). I had just purchased the PP3 the month prior, returned it to my local dive shop who contacted the distributor and I received a replacement. The replacement has been fine for over 2 years.

Not long after my issue, I read a review of someone having a similar issue with a PP3 with theirs happening on the airplane home from a dive trip.

I would guess an issue with the pressure sensor... emphasis on guess.

Cheers,

Jim