From memory, the display will switch to the basemap, but will still output Nmea
data. You should be able to simulate this on your chartplotter manually.
To answer the first question, download free Homeport, which will display locked charts, and borrow/download copy. (Will not work
on your plotter) If you like it you can buy it online.
Sent from my Hudl HT7S3 using Cruisers Sailing Forum mobile app