It honestly depends on the solution you choose. If you are wanting something more for security/monitoring, I would highly recommend Blink cameras (Amazon). they have nice functionality where you can trigger alarms etc, and mark zones on the camera to ignore etc. they also give temp which is nice.
for those you attach the base unit to a wifi network, and give it your own user/pass. so you could likely use that on a public wifi if its strong enough. The downside is they will disconnect everytime you leave the dock and will have to reconnect when you get back. i had mixed results with this on my first boat when doing this. For this boat, I bought an LTE router RUT950 and use netbuddy.co for an unlimited data for $60/mo and now have my own network that stays with the boat and gives internet even while cruising or anchored.
now i have the security cameras all throughout the boat, get notified of incidents, and used them to monitor temps through the winter etc.
if you really want to geek out, you can hook up some simple systems now to do automation for you if you have your own network. thinks like home automation. i tied in my engine/block heaters to some smart home outlets and can remotely turn them on a day prior so they are warm, can control my heat and ac to warm/cool it before we arrive etc.