I plan on installing the Wifi radar to go with my Axiom MFD this spring. On my boat, I have an open tap in the overhead radio box fuse / distribution block, so all I'll need to do is run power wire from Radar through hardtop and power it there - maybe 3 feet total. Then I'll add a toggle switch up by the dome light to power radar. Avoids the need to snake wires through the aluminium tube going to helm, which is somewhat tricky with existing wires in there.
Seems more and more companies are going to Wifi for MFD and accessories. Its obviously a reliable standard and only issue would be for very big boats where metal interference could be a problem. Not the case for a 22' Grady!