Welcome to the forum Dennis.
Most plotters that will accept NT cards will accept NT+ cards, but before investing you really need to check. The handbooks are available online.
used to have very good technical support, but since they have been sold it has suffered from cutbacks. They are good at making sure if you update one piece of equipment
you need to change the lot.
The scanner probably won't work, but anything with NMEA
or sea talk can be be made to function so the compass
is likely to be fine.
Post the exact models you have and what you wish to upgrade too and someone may be able to answer directly.