Need help to start contributing for Subsurface

Davide DB dbdavide at
Wed Dec 17 06:46:52 PST 2014

On Wed, Dec 17, 2014 at 2:03 PM, Robert C. Helling <helling at>

> what do you mean by "real time", all we do in subsurface is either
> retrospective or planning in advance?
> What I mean is: Average depth of the partial dive up to this point.
Sorry for my English,

I mean exactly that.

I wrrote a mail few days ago and then I had another exchange with Dirk.
Given that I did not get replies I didn't know you already implemented yet.
Thsi was my original mail:

---------- Forwarded message ----------
From: Davide DB <dbdavide at>
Date: Wed, Dec 10, 2014 at 10:02 PM
Subject: Another (strange) idea: dynamic average depth
To: Subsurface <subsurface at>

Hi all,

Given that the 4.3 is coming all new idea come to my mind :)

Average depth is very important for who use ratio deco or other
mnemonic system to calucate deco on the fly underwater. This is
specially true for tech dives.
GUE was the first agency to teach average depth use in overhead dives.

Nowadays a lot of instruments have this feature. Even the simple
uwatec bottom timer has this feature. It was suggested by members of
WKPP to Scubapro. Unfortunately it cannot be reset as in a lot of
other more professional and expensive instruments.
Even with a instrument which calculates average depth, it must always
be taken with a pinch of salt.

Instead of having a flat average depth line on the dive profile, why
we do not plot a line which reflects the real average depth in every
The end values will be the same that we plot now.

We could even have the current average depth displayed on the overlay
information window in the profile or just having this value and
nothing drawn.

In this way, a tech diver who use the ratio deco could see if his
mnemonic calculations were correct or not. We could find the way to
reset the average depth so it is calculated only on a part (leg) of
the profile.

This could be a 4.4 or 4.3.1 feature :)
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