The warning "Basic_string:_S_construct NULL not valid." indicates that the C-MAP eToken is not initiated, however this is not required when using NAVTOR ENCs. You can safely ignore this message but to remove it, you can follow the procedure below:

- Go to chart licensing

- Select C-MAP

- On the left hand side there is a checkbox for use C-MAP and please clear this checkbox and restart the ECDIS


If the issue is still not resolved by this, please contact Furuno support for further troubleshooting.