Shearwater Feature Requests

I dive almost exclusively with Shearwater computers (https://www.shearwater.com/). I believe that they are best computers for diving and have been tested on more deep, decompression dives than any other computer (by far). Many (most?) rebreathers use Shearwater computers today.

That said, I have assembled a list below of some of the features I’d like to see them add. This is based on my experience diving with their product in many real-life situations.

1. Deco Plan Display

Shearwater computers display the Time to Surface (TTS) including ascent time & decompression stops and show the next decompression stop depth and time, but don’t display the “deco profile.” It would be nice to see a display of all stop depths and times, similar to:

  • 40 feet – 1 minute
  • 30 feet – 2 minutes
  • 20 feet – 4 minutes
  • 10 feet – 10 minutes

2. Change Last Stop Depth (During Dive)

Since most of my diving is in the ocean, it can get rough at the surface so I generally conduct my last decompression stop at 20 feet. However, I set my computer last stop to 10 feet in case I want complete my deco obligation quicker. Because my last stop is actually deeper than what the computer is predicting, my Time To Surface isn’t accurate.

I’d like to set my last stop at 20 feet on the computer and then be able to change it mid-dive depending upon conditions and how I’m feeling.

I can set it at 20 feet and “violate” the 20 foot stop by checking that the actual ceiling is less and ascend to the ceiling, but then I have a deco stop violation and I just don’t like those. 🙂

It would also allow you to see the decrease in TTS by switching from 20 feet to 10 feet during a dive.

3. Copy Settings via Bluetooth

I often have three Shearwater computers when I dive with my rEvo rebreather. Two are “on-board” and have external O2 sensors (a Petrel controller and a NERD2) and a third (Teric) has an internal setpoint and is the “oh shit” computer in case my other computers die.

I’d like to be able to setup the gasses (CC/OC) and GF, etc on the Petrel and then “transfer” the settings to the other two computers for a given dive and then override some settings.

This would save time, but more importantly, cut down on possible error configuring gasses.

4. Bailout TTS

I thought about this one during some (deep-ish) wall diving in Grand Cayman. In rebreather diving, you always bring “bailout” tanks with open-circuit scuba regulators in case your rebreather completely fails. In fact, most dives on a rebreather are limited by how much bailout gas you bring and not the rebreather scrubber or gas on-board. It would be nice to know “if I bail out right now, what is my revised Time To Surface.”

This would allow you to extend your dive knowing what the TTS would be if you were required to bailout and you could estimate if your bailout gas was enough.

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