>>770146PMR is 446.0-446.1 however it's in channels.
If you want to learn the basics get pic related, it's cheap and will help, with the exam and just learning about radios in general.
btw listening to aviation and I think maritime is technically illegal but you'll be fine as long as you don't transmit or something.
https://ukrepeater.net/index.htmlUse this website to find out about your local repeaters. A repeater is a way of boosting the range of your radio, it also acts as the local hangout or w/e for local radio people.
Tune to the output or transmitting/tx frequency and you will need to enter the CTCSS code (way of allowing people to talk on the same frequency). You can find the codes on that website along with the repeater.
So input something like
145.700mhz
CTCSS code is 77hz
To access the CTCSS menu, press menu, type 11 in for R-CTCSS, that's receive CTCSS, hit menu again, type 77, hit menu again and you're done.
Also check the band plans for 2m
https://www.thersgb.org/services/bandplans/#19and 70cm
https://www.thersgb.org/services/bandplans/#21Different parts of each band are for different things, have a read through, transmissions on digital sections will sound like bollocks to you because they're not for the UV-5R etc.
I wouldn't bother with PMR for listening in, walkie talkies are not hugely common and are short range, just have a listen through everything really.