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I'm normally in the aerobars and the Garmin is near my thumbs so I don't even have to let go of the bars to flick the screen.
The Sony has been retired now. We still have a couple of them but now I've got a Samsung Xcover 4S and the grrl has the newer XCover 5. Yeah, she bought her own phone after my hand-me-down XCover 4 started being a dickhead.
My 4S is cracked in two places now so I might have to replace it sooner rather than later.
In rain, I normally just pick the map screen and then lock the screen.
So you find scrolling OK? Seemed like a faff to me, but never got used to it. I thought of getting the Garmin remote so I could do it from the hoods or wherever.
Your Sony sounds exceptional. I have two waterproof phones - Samsung and a Chinese rugged one - and both will start to play up when the screen gets really wet. Need to turn them off and just switch on for quick glimpses before junctions, etc.
I have a separate app for intervals (or TT if I ever do one). It has a lap button and has data fields in different colours so easy to read. For TT just need a couple of numbers as don't want to have too much to think about.