On hardware and WiFI in detail:

As a simple device we use HI-LINK HLK-WR-02 Serial Server, a RS232 WIFI Server to set up a local WIFI for transmission of data to hand-held devices like IPAD/IPHONE or similar.
This product may be ordered via Amazon. For set-up, a separate installation procedure is available as we have installed on a number of boats.

For WIFI installation vyachts offers a router which shows an enormous versatility by accepting data from NMEA 0183, N2K or Seatalk systems. So far we did not install any of these units yet.
Move on to learn how to navigate with a tablet computer