Understanding The 70cm Organization

I'm very confused about the 70cm band.



420-450 is listed as the band.



However, I see a lot of wireless equipment, mostly weather sensors, on 433 MHZ.



Most radios don't even cover the whole band, just 430-450, or some, 440-450.



I've read the ARRL band plan, and a lot of other info that I can find, and I've yet to come across any info about it being a shared band, or Hams being secondary users on some portions.



Any more experienced operations care to enlighten me?



Thanks,











Delta