Simrad USB Audio Adaptor for NSO 4 and Zeus SRX Displays

The Simrad USB Audio Adaptor is the factory cable that gets sound out of your NSO 4 or Zeus SRX display and into the rest of your boat's audio. It carries part number 000-16328-001, and it's built to do one job cleanly: take the USB audio feed off the back of the multifunction display and hand you a standard 3.5 millimeter audio jack you can run to a stereo's aux input. The kit is a 16.5-foot main cable with a short 5.3-inch pigtail, finished in black and silver to match the rest of the Simrad rigging behind your dash.

Here's what makes this one worth having in the box instead of a generic adapter. It's not just a simple splitter. One end is a USB male that plugs straight into the display. From there you get two things: a USB female pass-through so you don't lose the port, and the 3.5 millimeter analog audio jack for your stereo. That means you can still run a USB stick or another accessory off the same connection while the audio is being routed out. On a helm where USB ports are always in short supply, that pass-through earns its keep.

We see this used most often on center-console and express boats where the NSO 4 or Zeus SRX is the brain of the whole helm and the owner wants chart audio, alarms, or media routed through the boat's main stereo instead of the display's small internal speaker. The 16.5-foot run is long enough to reach most helm-to-stereo runs on a mid-size boat. Route it, and if you've got extra, coil the slack neatly behind the dash rather than leaving it to flop around. A few zip ties along the run keep it off sharp edges and away from anything that vibrates. Cable chafe is the quiet killer on a boat, and this cable is no exception.

A couple of install notes from the field. Seat the USB male end fully into the display. If it's even slightly loose, the display can throw a device error and the audio simply won't pass. It's an easy thing to miss behind a crowded dash, so give it a firm, square push and a gentle tug to confirm. If you ever hear engine or alternator whine come through the stereo once the motors are running, that's electrical noise riding the line, not a bad cable. A snap-on ferrite choke around the USB lead usually cleans it right up. And keep the run away from VHF and other high-current cabling where you can.

On the stereo side, you're plugging into a standard 3.5 millimeter aux input, the same kind of jack you'd find on most marine head units. If your stereo only takes RCA in, you'll want a simple 3.5 millimeter-to-RCA adapter on the end, which is a cheap part you can pick up anywhere. Check your head unit's inputs before you start so you know exactly what you're landing into. The short 5.3-inch pigtail is deliberately compact, which is great for a tidy termination but does mean you'll want your connection point close if you're working in a tight bezel space.

This is genuine Simrad gear, not a look-alike. When you're wiring audio into a helm that's already running a NSO 4 or Zeus SRX, matching the factory cable takes the guesswork out of connector fit and keeps your install clean and serviceable down the road. It's a small part, but it's the difference between audio that just works and an afternoon of troubleshooting a bargain cable that never seated right.

One last thing on expectations. This adaptor moves audio and gives you a pass-through USB port. That's its whole job, and it does it well. It doesn't add Bluetooth, it isn't an amplifier, and it won't change your sound quality beyond passing a clean analog signal. If your goal is simply to get the display's audio into your boat's stereo without fighting mismatched connectors, this is the right cable. Order it, run it once, and forget about it.