I think my Ipad 2 with an external GPS antenna might finally be retired(still works fine). It started as back up to an old hard wired CP(still works fine). But it became the better planning CP with the larger screen.
Then the iPad became the more depended upon CP. An iPhone with another nav app became back-up to the iPad, the Garmin became back-up, back-up.
I retired my last iPhone (6, something- still works fine) and have gone to an 11. I didn't want the extra size of the 12 (or the cost) as it lives in my pocket.
The new iphone is essentially the same pocket size (a bit bigger), but the screen is much bigger. Here's my harbor on both:
I've been trying to settle on a small CP to replace the ancient Garmin on the mount that swings in an out of the companionway (still works even after the last, big, GPS whatever it was,...). I like that it only uses 4W as it runs 24/7. It's a great anchor minder.
But I notice, the screen on the old Garmin is 5" dia. My iPhone is over 6" dia.
And my wife has an iPhone 12 which is substantially larger in screen size (and a better zoom lens for me

). We'll put Navionics on that as well.
At this point, I'm not sure what I'll do with CP's.