Sure there is, it's called a 5 gallon Jug! I use to travel with one in my TrunkYou are comparing apple and orange!!!!
There is NO redundancy for tank in any car! Are you aware of that?
A spare is supposed to be something you use in an emergency, not something that you carry as a backup for equipment that you know has issues.I dive with a spare computer all the time!!!
I changed the battery before diving trip.
Actually I do but your english is fine.Do you have problem of understanding my post?
I am not going to roll in the mud with you so I will be polite and not respond to that.The rest of your post is plainly not relevant and rubbish.
You have yet to give an example that your Teric is superior than my 23 yrs old Uwatec in providing essential and necessary to execute a dive. Please keep your own preference to yourself!
Whats the point of answering you? Anything someone points out will be answered by you saying it is not essential and since a DC in itself is not essential including your precious Uwatec it's kind of pointless.What is your definition on essential diving information that every dive computer must be able to provide?
For me I certainly think that AI makes for a great primary to an SPG but maybe I am partial because I have run out of gas due to a faulty SPG. I also think that SurfGF is a very useful item that could save me from DCS along with the other tissue info provided. Also nice to have a spare compass without carrying anything extra. SAC, GTR all nice things to have that add safety.