Which dive computers provide average depth in their logs?
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KeithG
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Which is meaningless after the dive. 5 minute moving average? 10 minute moving average? A moving average is used to provide "moving" information about a small segment of a data set. It will start to ignore the beginning of your dive.
Maybe you are thinking of weighted average?
My point is that there are many different averages. Which one does your dive computer provide?
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You want your average depth so that your download software, or you, can calculate your RMV. I dive an AI Oceanic VT3, the download includes both my avg depth and my RMV
If you do not have an AI computer, you must track your gas consumption with starting and ending pressure. There are many simple applications to assist you in the calculatons DiveNerd - SAC Rate / RMV Calculator, Imperial Units
If you do not have an AI computer, you must track your gas consumption with starting and ending pressure. There are many simple applications to assist you in the calculatons DiveNerd - SAC Rate / RMV Calculator, Imperial Units
boat sju
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I didn't read it as a hijack. I thought it was a fair question. I have used it to calculate my SAC, but I have to admit I never thought about what my computer was actually doing. Intuitively, I figured it was a simple mean, but that's not necessarily what it is and you may actually want it to be something different depending on how you use it. If indeed the sole purpose is to calculate SAC, then a simple mean is probably best, but just because that's how I was using it, doesn't mean that's why it was put there. Perhaps I was hijacked, but it made me think and so it was worthwhile.
eelnoraa
Contributor
Correction to the definition. It is NOT "cumulated moving average", it is "Cummulated Time Weighted Average" if you will Take two quick examples.
1. if you spend 10 minutes at 100ft, then 10 minutes at 50ft. Your average depth is 75ft. Obivous, right
2. if you spend 10 minutes at 100ft., then 40 minutes at 50ft. Your average depth is only 60ft. it is average over the dive time
I use this number during the dive too, so I prefer a computer with such a feature. One way I use it is to determine my average SAC during the dive. I know what it should be, and I keep track of it mentally and only double with gauge every so often. If I am way off, I know something is not right, either I am working too hard, something makes me uncomfortable, something is leaking ....
I also use it for reference for a few other decision, like time to ascent, deep stop depth .... I like it and I won't buy another computer without real time average depth
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