CMIIW but the Teric can concurrently display the Compass dot on its screen thus delivering MORE info than the Perdix.
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Well, I think John is probably right. From what I have heard about him, I suspect he is correct. Meaning, his reputation is such that I doubt he would say that unless he had verified it for himself.
And from earlier posts in this thread, it may be that he setups up a Perdix to show things like @+5, and other things that most people do not use, on the main screen, so you can see it all without touching any buttons. And maybe with what he configures to show there, you cannot configure a Teric, even in OC Tec/Standard (i.e. 4 rows) mode to show all those things at the same time.
That is why I'm asking the question. And why I asked if somebody could post a picture of a Perdix screen that is setup the way JC has his students set theirs up. Or at least tell in detail how the screen is configured. Or screens, if he uses two and has them set differently.
I understand his other reason. If you can't change GF Hi during a dive, well, I think that is valid as a reason for him to reject using one as a primary. So, the question about what is displayed is purely academic. I would just like to know the answer.
For the people who seem bitter about rejecting a Teric because it doesn't allow you to change the GF Hi... well, @doctormike has already explained it pretty well. There are various reasons one might want to adjust it up OR down. It just depends on the specifics of the dive. But, while you may think that riding GF99 or SurfGF is so close to the same that it doesn't matter, it seems we all do agree that it is NOT the same. So, it's down to your judgment of whether it's "close enough".
And, so far, I haven't seen anybody weigh in and say it's "close enough" that seems to have remotely the credentials or experience that JC does, for making that judgment call... Personally, I think it probably is totally close enough - when your deco obligations don't even start until you get up to 10 or 20 or 30 feet. But, when your first deco stop is at 120', then I think it makes more of a difference - and maybe that difference DOES matter at that point. I certainly do not have enough experience with diving that deep to gainsay John Chatterton.
... So, the question about what is displayed is purely academic. I would just like to know the answer.
...
...But, while you may think that riding GF99 or SurfGF is so close to the same that it doesn't matter, it seems we all do agree that it is NOT the same. So, it's down to your judgment of whether it's "close enough".
And, so far, I haven't seen anybody weigh in and say it's "close enough" that seems to have remotely the credentials or experience that JC does, for making that judgment call... Personally, I think it probably is totally close enough - when your deco obligations don't even start until you get up to 10 or 20 or 30 feet. But, when your first deco stop is at 120', then I think it makes more of a difference - and maybe that difference DOES matter at that point. I certainly do not have enough experience with diving that deep to gainsay John Chatterton.
I'm guessing it's because the first post said the reasoning given was "The Teric is okay for backup, but not acceptable as a Primary as it does not give you all the dive data of the Perdix/Petrel."What I don’t understand is, why do you think the problem with the Terric has anything to do with the information it can display.