You can activate a notice when various talk groups, frequencies, etc. are changed specific to what you choose. For instance, you can add systems/frequencies for your county or selected trunking system. I have around 10 or so I monitor. In the event a talk group is added, typically, the color will initially turn green. After a few days, it turns to a yellow. That way you can keep your systems up to date. You can activate the various systems by clicking the "watch" button at the top of the page you are referencing.