There is existing incident management doctrine for this. Approvals for the release of information are channelled through the Incident Controller.
The Incident Controller may decide to delegate authority for certain updates to the Incident Map Room to functional officers, such as the Intelligence Officer or Planning Officer.
The frequency of updates to the Incident Map will need to be determined at IMT meetings to suit the needs of the Common Operating Picture for the stakeholders involved. EM-COP is designed to facilitate more frequent updates where possible to stakeholders.
For further information see How frequently should the Incident Map Room be updated?