# Create a Vessel Master user

The functionality with establishing a master role involves giving them access to only their relevant port calls. In order to establish this filter for the user we need to link their credentials to their particular vessel. 

Pre requisite for below is that vessel has been created, [user for the vessel](/release-8.25/voyage-management-system/step-by-step-guides/setup/users/create-users.md) has been created with security role "Vessel" (only this security role) and [internal data tab should be enabled](/release-8.25/voyage-management-system/step-by-step-guides/vessels/internal-data.md).

Step 1: Access vessel master data screen and insert vessel user in the "Master User" field as indicated below. This action will link the vessel to the user so that Crew only see their relevant port calls in the VMS

![](/files/-Lt4KEsoomB6fw_9Tfst)


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