Units designed for sale in the Americas will have limited Language and Units
functionality outside of a zone defined as 30 degrees West longitude on the
East and the International Date Line on the West. Language options will be
restricted to English (US) only and Units will be restricted to non-metric
Units sold with Enhanced US Basemap, Nautic Insight, Lake Insight or Insight
USA units are impacted and will not have this functionality outside of the
defined region. Units sold with WorldWide Basemap will function without
Have you used a UK map in your USA unit yet? Your plotters will certainly share a map card - but over Ethernet, not NMEA2000. I doubt that pointing the unit to another GPS will make any difference to what you are seeing, although it can be done. I'd have a play with the UK chart in the unit and mess about with GPS formats - see what happens.