You need to have a Navigraph subscription in order for it to work. If you do, go to IDX>NEXT>MOD SET and on the right you will see an option called NG Link. To link a chart subscription, click on LSK 5R next to NOT LINKED to begin the process. A web browser to Navigraph will then open up asking for the WT CJ4 to access a token on Navigraph’s servers. You should only need to repeat this process once. Working Title at no time has any access to personal information in this exchange. It is an OAuth Device Authorization Flow for which the CJ4 simply asks Navigraph for an access/refresh token once they verify the account through the weblink. All of this is stored locally on the user’s machine.
I took this from the Working Title CJ4 Users Guide that you can find here: https://docs.google.com/document/d/1qzxPMTSQRkvau8QOi7xUqNvjx9rbww_qHlso5AT5OnI