em-trak B954 Class B SOTDMA AIS Transponder with Integrated Splitter, Wi-Fi and Bluetooth

Good accuracy and signal quality, GPS feed was solid. Since the Milltech folks did the configuration it was a "plug in and go" process. Overall I am very pleased, but encountered similar fit issues as reported by the other reviewer. Some is due to the small available space on my boat, so check this on yours before ordering to avoid disappointment. The cables will stick out straight from the box so you will need to allow at least a couple of extra inches on each side, even if you can use right-angle connectors. However, the provided NMEA 0183 cable has a connector (which also has the power leads built in as a secondary cable) that sticks out 3". I looked for a right angle connector version or just one for the power leads (I am using a NMEA 2000 network) but no luck.

This AIS transponder has all the bells and whistles and performs very well. I typically track pleasure boats at 20 miles, commercial traffic at 30 miles, AToNs at 60 miles, and the record is a oil rig at 178 miles! It puts out a strong SOTDMA signal and have observed large ships alter course to avoid us when we were barely in visual range at night. I use the built-in GPS, have it mounted just below deck, and have not had any GPS issues. Installation was easy, the only issue is that there are multiple cables that plug into opposite ends of the unit, so finding a good mounting location was problematic. Also the wifi didn't work out of the box, I had to plug it into a laptop and use the utility program to re-enable it.