To help limit the impact of inappropriate gameplay in Ingress, the Compartmental Access Level (CAL) system protects select Portals on the gameboard. Agents with insufficient Compartmental Access will receive the following error message when attempting to interact with specific Portals:
Insufficient Compartmental Access detected. Higher Compartmental Access Level (CAL) required to interact with this Portal.
An Agent's CAL is dynamic and may increase or decrease over time.
The CAL system will only trigger for some Portals and only for Agents with insufficient access. While these Agents will not be able to interact with CAL-protected Portals, they will continue to be able to interact with other Portals without restrictions. Portals under CAL-protection are known strategic Portals used in past Agent operations, as well as a dynamic list of Portals based on XM and Portal Network fluctuations.
Regular gameplay activity may increase your Conditional Access Level over time and grant access to CAL-protected Portals.