Cobalt issue

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Reaction score
Redmond, WA
# of dives
100 - 199
I went on my first dive in almost a year today, with my cobalt. It’s battery charge was 96%.
When I first got into the water, it read,”dive 1”. After a few minutes I noticed that it said dive 5 (?). Maybe 20 minutes in I was on dive #22 and it was saying I was 10 min to deco. Computer said my max depth was 73ft but I was above my husband at all times and his max was 70. I went to what my computer said was 50 ft and showed it to the DM ( now I am reading that I am at dive 33). And it hit deco. Followed deco with my 2 min at 40ft then a safety says I’m at 17 ft but I am clearly more shallow than that. At surface it still read 9 ft.
So now, almost 2 hrs later, it still thinks it is underwater at 8 ft and I am on dive #149.
I can’t get to settings because it is still timing my dive.
Suggestions? Anything other than waiting for the battery to go out and sending it in?
I’m bummed because up to now I have loved this computer.
Thanks in advance


Reaction score
Washington State
# of dives
I just don't log dives
Sorry I missed this post until now. My best guess (a virtual certainty based on what you say) is a malfunctioning depth sensor. It can be replaced.
How old is the computer, and is it a Cobalt 1 or 2? I'm guessing you are out of warranty?

We are the original designers/ developers of the Cobalt's electronics and firmware and would be happy to help get this back diving- we put up a page here on ScubaBoard for support questions. If you are in Redmond we are just a few miles away. I'll send you a message with contact information.


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