... If you have a plotter, an AIS receiver is not much money. We all know cell signals have dead/slow zones and the internet can slow down etc..All these internet apps depend on shore stations so there are dead zones wrt that. Swinomish channel being one. If, (for some reason), you find yourself playing around in the shipping lanes at night or with limited visibility, the absolute best thing you can do is converse with Seattle Traffic on chan 5. If youre really honked up and disoriented, it s OK to admit. They can find you
That IF is the problem. I have a chart plotter, but it was made before AIS was a "thing" so to get AIS on my chart plotter would involve buying a whole new system which will be a lot more than the $10 dollars that Boat Beacon cost me.
I concur that the coverage sometimes drops out which is why I look for boats that are 45 minutes away to see who is heading in my direction. The AIS will tell you what port they are headed to which enables me to anticipate if they will be heading up the channel that I am crossing.
The first time that I used BB was in the 2013 Northern Century Race which is a 100-mile race around the San Juan Islands. On the first night I was at the north end of Guemes east of Sinclair Island at 2:00 a.m. in zero wind doing 360’s in the current when the collision alert went off. I checked the screen and it said that in 10 minute the
Norther Columbia, a 510’ bulk carrier would pass within 200 yards of my passion at about 16 knots. I picked up my VHS and hailed the Northern Columbia by name on channel 5 and got an immediate response. I informed them that my AIS informed me of the 200-yard approach they asked for a light to get a visual. This done they altered course 2º starboard and passed with about ½ mile separation.
Given my position and their need to turn west it is very likely that they would have done directly over my position had we not made contact. Their bridge confirmed that they had seen a small blip on the radar but attributed it to scatter. I let them know that there are 40 other competitors with me in the race.