These settings control accessing the "Extra" feed, which is used for Own-Ship data. AIS data is not allowed on this feed.
Please see NMEA & AIS / WiFi for more detailed information.
Host (Only SEAiq Pilot) : This is used to set the IP address of a TCP-based NMEA feed. You can specify either a hostname or IP address (decimal and dot). IP addresses are preferred because they do not require a Dynamic Name Server (DNS) to be configured.
This field is not normally used for UDP feeds. For UDP, it can be set to an IP address in decimal and dot format. When set, only data from the given address is accepted. Currently, this is only required for Trelleborg CAT I (v3) devices.