I downloaded the simulator software for the Hydrotech Explorer to have a look at what it can do and I very much like what I have seen so far, as it appears very flexible and user friendly. However it is a sophisticated instrument and not suitable for the uninitiated. Perhaps it could be compared to a Harrier STOL fighter. It can do very complex manoeuvres but it can also be used as a more simple device depending on the ability of the user to program it properly.
What I like is the ability to use the dive computer itself as a means of generating a set of tables "in the field" and to print them out on a PC (at least in theory) and take the computer along as backup, if not the primary electronic "table". Unlike the VR3, which I understand does not, you can choose the algorithm to suit your own circumstances and the circumstances of the proposed dive (including RGBM which is to added this year, I gather). It also appears to have a very readable screen with a backlight
I have five questions around, what I consider to be it's shortcomings.
1) Although it has a buzzer, which works when you press one of the buttons (if switched on) it has no audible alarms when on a dive. For instance when you are approaching, or have exceeded, your no stop limit. Nor does it have an audible alarm to warn you that a gas change is due. Is this an oversight as both of these would be extremely useful?
2) While it allows you to look at OTUs I can find no referece anywhere about CNS oxygen toxicity. For example it gives you no warning if you have - or will exceed - the NOAA limits for oxygen CNS exposure during a actual or a planned dive> Nor does it appear to provide you with any sort of alrm if you exceed a particular pp O2 (such as 1.6 bar).
3) Perhaps it the is the fault of the design of the simulator program, rather than the computer itself, but when running a simulated dive the bottom timer appears to stop when you start to ascend so you cannot tally planned run times with what the computer says during decompression.
4) I think the generated decompression tables will be very useful but I am having considerable difficulties in tranferring the data into an excel spreadsheet, which is a real pain.
5) It has taken me literally hours to decipher how the buttons are used. Now I have cracked it the code it is simplicity itself but it does not read in the manual that way.
I very much like the idea of being able to see what you are paying for before you buy and to be able to download the simulator, as so many computer manufacturers rely on recommendation and word of mouth only. I can get no information about the new VR3 for example.
However I am saving my pennies. Is there a UK supplier? If there is I cannot find him!
