Ais receiver, cheap
SI-TEX AIS receiver, $200 obo. Easy install, NMEA or USB.
I used this for two years, prior to upgrade. I simply plugged it into my Coastal Explorer laptop. No need for ship's power, USB provides. Does need a simple VHF antenna or splitter (dedicated antenna is cheaper.)
PM me here.
I'll deliver along the I-5 corridor, or ship at your expense.