Raymarine RS232 Owner's Handbook Manual page 7

Operation and Installation
3. Alternatively, the PC/SeaTalk/NMEA Interface box may be
attached using the 2 self tapping screws provided.
4. Remove the top of the Interface box by squeezing the lid at each
end and pull away from the base.
5. Route all the necessary cables into the Interface box.
6. Connect the wires as described in Chapter 3. Also, secure cables
close to the unit.
5