Adding a 2nd A78 mfd with wifi

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum roch1213,

It is not possible to interface the MFDs to one another via Wi-Fi. However, given the equipment which you have listed, I suspect that you will find that the first MFD has been interfaced to a HS5 RayNet Network Switch, to which the radome and DSM have also been interfaced. To interfaced the second MFD to this system, you need simply connect its Ethernet (RayNet) Network socket to one of the remaining Ethernet Network sockets of the HS5 RayNet Network Switch via an appropriate length of Raymarine’s web site.