It's informative to hear JC's reasoning and thanks
@loosenit2 for cutting through the noise nicely.
Paraphrased
JC's said:
Via email:
1. The Teric does not allow you to change GF High while diving, while the Perdix and Petrel do. <-- historically correct and probably still is, but if someone can check if it's still correct post recent FW updates (or await SW's reply via LoosenIt2)
2. The larger screen size of the Perdix and Petrel allow you to see more data on the screen without having to scroll screens to see other data elements. <-- You can also configure the Teric to show "other elements" (including programmed GF) without having to scroll, and all three of the screens seems to have the same overall data capacity. Sounds like it he might be stretching it on this one. I say "might", as of lot of us have jumped on this thread quickly and not thought about 1/ .. and the tar and feathers sure got blown back! (regardless of the pros/cons/'not using new features' aspects of it).
and from the website;
3/ Shearwater - because it in class we'll download and dissect. <-- his class, his call. But ... depending on what software he's using, it's a bit marginal. But, it's his call. (does he really turn away an EON Core diver??)
4/ The Teric's okay for backup, but not acceptable as a Primary as it does not give you all the dive data of the Perdix/Petrel <-- that's not an accurate statement by itself, but probably no more than a sloppy way to say 1/ and perhaps 2/ as per his email clarification.
Websites tend not to be often updated, but given his email response it appears either he doesn't know about SurfGF and how to use it, OR wants to keep doing things the way he did, OR for some other reason he wants to be able to change GF during a dive? (cue tar & feathers round 3).
So, can anyone whose done his class let us know what these "other data elements" are and/or why he needs to change SurfGF on the fly?