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Computers!? D4i or Geo 2.0?

Discussion in 'Dive Equipment' started by b_lewis, Feb 8, 2012.

  1. b_lewis

    b_lewis New Member

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    Im currently in the market for a computer. i have narrowed my options to the Suunto D4i and the Oceanic Geo 2.0.

    Theres not a huge amount to choose between them in terms of spec, but id like some advice from other divers before i part with my hard earned cash.

    Im after something that is watch sized that can be used in and out of the water. trying not to break the bank but need something that is going to last a while.

    Any help would be awesome, thanks.
     
  2. Silty Bottom

    Silty Bottom in DIRnial

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    No experience of the computers in question but have you used a watch-sized computer before? From what I've heard from other users the displays can sometimes be quite small and difficult to read underwater.

    At £300 for the D4i the world is your oyster when comes to other popular computers in that price range such as the Suunto Vyper, Apeks Quantum, Tec2G etc
     
  3. Shoka

    Shoka Stripy Fish Specialist

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    Oceanic computers including the Geo 2.0 (and the Veo 180NX that I use) offer the DSAT algorithm. This is the least conservative of modern algorithms, and makes no provision for deep stops on decompression dives. see http://www.mikesdivestore.com/article/205/Oceanic-Dual-Algorithm.html for bumf including some research results to justify the omission of deep stops on decompression dives. The Geo also offers a more conservative Buhlmann algorithm.

    Sauunto computers including the D4i (as far as I can tell) use the RGBM algorithm, that does include provision for deep stops on decompression dives, and is generally more conservative than DSAT.

    There is no present consensus as to the value of deep stops, particularly for recreational diving profiles. (or any consensus on what is a typical recreational diving profile actually. What is discussed as such bears no relation to the style of diving I see at the diving locations I've been to.)

    http://www.alertdiver.com/255 seems a fairly recent discussion of the issue.

    As far as I can tell from the manual my Veo does not offer the Buhlmann algorithm, else I would select it.
    If I was to buy another computer I would probably choose Mares or Sauunto with the RGBM algorithm.

    I'd read what you can on the subject and choose based on the computes underlying algorithm, and its applicability to the diving you plan.

    I've no experience of either computer to comment on the usability or reliability of either device.
    Readability under water would be much more a factor for me than being watch sized and shaped.

    Cheers Harry
     
  4. aquanaut

    aquanaut Well-Known Member

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    It can have all the bells and whistles you like , but if you cannot read it easily in the dark and sometimes mucky waters you may encounter, it aint no use. Something with a good size face and an easily discernible read out .
     
  5. madmark1

    madmark1 Member

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    mares nemo wide 3 gas with deep stops
     
  6. Sharkbait

    Sharkbait Member

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    I have the D4i. I had the Vyper air prior to that with the air transmitter and never had a problem with it but when I took up Freediving last year I wanted a computer with "Free" mode on it too so went with the D4i because it is also compatible with my transmitter. I honestly dont find it any harder or easier to read than the Vyper whether i'm in a muddy puddle or the red sea, if anything I prefer it to the vyper because its not so bulky and I can wear it as a watch if I want.
     
  7. Silty Bottom

    Silty Bottom in DIRnial

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    Is there much difference between "free" and gauge mode?
     
  8. Sharkbait

    Sharkbait Member

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    Freedive mode has better sampling rates than the Gauge mode and also logs each dive profile so it can be downloaded to my computer
     

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