A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Damian Lopez
Date: 2019 Jan 24, 10:39 -0800
There are less costly alternatives to transponders that won't make you visible to others, but will give you first hand information on nearby vessels. Some marine radios can also show AIS traffic:
Icom has a similar product (IC-M605 ) but it costs as much as a transponder. Personally I'd invest on a transponder, but that's just me. I'm not trying to convince anyone, just providing information; we're all adults.
PS: I provide these models just for information. I have no ties to the manufacturers nor make any money from their sales.