Pro Plus 2

[Steve Boyd]

It's this timestamp that is causing the trouble in your case. Normally 
with a
> time based sample rate, there is a fixed number of samples per time unit. For
> example a 15s samplerate will always have 4 samples per minute. But that
> assumption is violated in your problematic dive. There are 5 samples with a
> timestamp of 37 minutes. I have absolutely no idea why the dive computer does
> this. It's the first time I encounter this.
I've seen this in some of the dives downloaded from my proplus2.  Don't 
know what causes it. I've had it occur right at the beginning of a dive. 
i.e. time stamp = 1 minute.