Either turn off the automated announcements, and do it manually, or just let the automated ones do their job.
Some sets, it is near impossible to turn the PIS off, thus the only way of blocking it is knowing the GPS location then announcing over it when it starts. 'Tis a crucially important skill when the polished jolly-posh recorded PIS is announcing all the wrong stations due to GPS fault or when service alterations are taking place, the automated announcements often cause chaos by announcing something five minutes after a DOO driver / guard has just announced the absolute opposite.
Announcements should be clear, to the point, and handsets made properly to not broadcast background noise. The (Eversholt?) modified EMR & Northern 158s are one of the worst examples... previously an excellent PA & speaker system - the new PA on most of these is grainy crackly dalek-esque - even with some of the best guards announcing is diabolical - the contractor should not have been paid fully for it's work.
I get the point that some guards/drivers do prattle on... but I'd have useful, straight to the point, clear, short manual announcements over repeated 'see it say it...' junk any day.
I note some consider manual announcements an annoyance. Many passengers don't use apps or are foreigners, and quite often the confusion and crowding at interchange stations delays services - clear, quick announcements often ensures passengers are in the correct bit of the train, and up, off nice and quick at stations. Leaving robot-annie to announce, often ends up with passengers stood in doorways unsure if this is their station OR in the wrong half of trains pulling the door release handles and sticking a 5 to 20-minute delay on.
I can't stand
Automated announcements This train is now approaching it's final stop, this is XXX, etc.
Guard: As you have just heard, we are now approaching our final stop etc.
You literally just confirmed that we'd already heard it. So why are you saying it again?
One would guess the guard/driver actually means "Oi, GTFO the train, it's goin the shed". Amazing those still sat on 5 minutes after arrival glued to some rubbish on Instagram.