got the answer :
Re: Navico radar
using a 4G radar with both a mfd (zeus2 7" b&g) and a laptop
can i put a passive splitter before to arrive at the r10 interface and use the second output for the laptop
? have i use the last only as a slave ?
No, a passive splitter will not work. You need a hub, switch, or router.
The laptop (RADAR plugin) can be a slave or master.