There are portable AIS systems that will work with a IPad at very reasonable cost.
The
Marine Traffic app is a great option for viewing vessels with AIS send capabilities.
There are some $$ features available but the basic app is free.
Just had to replace my B&G VHF with AIS (receive only) on my boat.
Upgrading to a B&G with AIS transceiver (send and receive).
Better to "See and be seen"!
BTW - AIS works off of your regular VHF antenna
