AIS information is shared among many users that have built a pretty good global coverage of the coastal maritime traffic in real-time
In order to share, normally you just need to have your own base station:
In order to have your base station, we recommend using a simple but powerful AIS receiver with USB port, that will allow you to simply plug it to your computer using the USB port, and plot the AIS messages in any of these free AIS decoder programs.
As additional software, you would need a basic VHF antenna that you will have to secure in a place with good visibility towards the coastline that you would like to cover.
These are some of such networks that will accept your feed:
Good luck! and enjoy sharing your AIS data!