Security is problem anywhere. And also in the basic level. Last week in one of Croatia marina I tried to connect to every single available wifi hotspot by standard wifi password “name of charter company”. 90% success. Then connect into gateway (mostly single type of portable LTE gateway) through 192.168.1.1 address and password “admin”.100% success. Then you can re-setup the network, what is not tech heavy action. Then you can connect into B&G navi devices and re-setup basic values as compass calibration, declination, deviation, map setup, what is dangerous for sailing newbies ..... or boat stereo volume.
Of course, this not part of my approach. Just inform you, how insecure environment we can use. Or they use.