Not everything uses AIS! Using MARPA* (mini-automatic radar plotting aid) allows you to identify vessel, speed, bearing, closest point of approach (CPA) and time to closest point of approach (TCPA), dangerous/ proximity alarms, overlay AIS info for further target clarification.
Image shows a tracked target in the previously set guard zone around your vessel and has triggered the dangerous target alarm, seen on screen, and set off an audible alarm.
Raymarine HD Colour scanners provide superior all weather performance allowing you to still see targets through rain and thunderstorms. Use radar to track weather too.
Image shows an abnormally heavy rain storm, rain mode (right hand screen) was used to cut the clutter to clearly reveal the targets.