The "user permit" of ENC charts is a unique identifying number attached to a device, or to an application, able to read encrypted ENC chart data (format S-63). This “User Permit” is required to register a system (chartplotter, MFD, software) and thus make it possible to generate, for charts purchased, a single authentication code to use these charts to the referenced system. User Permit (User Permit) consists of a chain of 28 digits hexadecimal code.
Let's take the example of a purchase on the site Chartworld.
You create an account on this website, and want to buy an official ENC card : General chart of the Atlantic coasts of France.
Previously, You will need to fill out the form describing your installation, in menu "My Account" > My Installations.
You are asked to fill in the fields on equipment used primarily to display charts (from the drop-down menu you will choose MacENC/GPSNavX), the name of the ship, hardware identifier (not to be completed in this case), as well as the famous "User Permit" and all the mandatory fields preceded by an asterisk.
The User Permit is provided to you in the Card Manager by MacENC :
You have just to copy / paste that code in the Chartworld form :
Once you have registered your form, you can return to the "SHOP" section of the site to fill your cart and proceed with your card purchase. The charts that you download will only may be used on the Mac which is running MacENC single user license.