Icom M510 vs M605: Which VHF Is Right for Your Boat?

By the NVN Marine Expert Team — Our team has spent 10+ years on the water installing, testing, and troubleshooting marine electronics from the Gulf Coast to the Great Lakes. We're authorized resellers for every brand we review, and we only recommend gear we'd trust on our own boats.

A guy called the shop last spring trying to decide between the Icom M510 and the M605 for a 28-foot Grady-White. He'd read every spec sheet twice and was more confused than when he started. Both are 25-watt Class D DSC radios. Both have color screens, built-in AIS as an option, NMEA 2000, and active noise cancelling. On paper they look like the same radio at two price points.

They aren't. These two units were built for different boats and different helms, and once you understand why Icom keeps both in the lineup, the choice usually makes itself in about thirty seconds.

We've installed both — the M510 EVO on everything from bay boats to sailboats, and the M605 on bigger sportfishers and trawlers where the owner runs a second station up top. Here's the honest breakdown of where each one belongs, what it actually costs in 2026, and the stuff the spec sheets won't tell you.

Icom IC-M510 EVO: The Modern Single-Helm Radio

The M510 was Icom's swing at dragging the fixed-mount VHF into the smartphone era, and the EVO version fixed the one real complaint we had about the original.

Here's the backstory that matters. The first-generation M510 did not have NMEA 2000 built into the radio — you had to buy the CT-M500 commander module to get it onto your network backbone. That was a genuine annoyance on installs, because half the reason you buy a radio this nice is to pull GPS off the network and push AIS and DSC position data back out. The EVO put NMEA 2000 right in the box. If someone offers you an "M510" at a suspiciously good price, check whether it's the EVO or the original, because that one port changes the whole install.

What you get with the EVO:

• 3.5-inch color TFT display
• 25-watt transmit, Class D DSC with a dedicated CH70 receiver
• Built-in NMEA 2000 and NMEA 0183
• Smartphone control over Wi-Fi via the free RS-M500 app
• 25-watt two-way hailer with listen-back
• Active noise-cancelling on transmit and receive
• Optional integrated AIS receiver (the version most of our customers actually want)

The smartphone piece is the headline, and it's better than we expected. The radio creates its own Wi-Fi access point, you pair your phone with the RS-M500 app, and you get full remote control — change channels, make DSC calls, even use the intercom. On a 30-something center console you can walk to the bow, set the anchor, and answer a hail from the cockpit without running back to the helm.

Now the honest part. That Wi-Fi link is the radio's own access point, not your boat's network and definitely not the internet. Range is fine across a normal-sized boat. It is not fine from the dock or the parking lot, and if your phone drops the connection — which happens if you wander too far or your phone aggressively hunts for a cellular signal — you lose remote control until it re-associates. Treat the app as a convenience, not as your primary radio. Your hand mic is still the thing that matters when it counts.

One more practical note from the install side: the M510 is shallow. Behind-the-dash depth is tight compared to older Icom fixed mounts, which makes it one of the easier radios to fit into a modern molded helm pod where you've got six inches of space and a rat's nest of wiring already back there.

If the M510 EVO is on your list, you can see current pricing and the AIS-equipped version on our Icom IC-M510 EVO product page.

Icom IC-M605: The Flagship Multi-Station Radio

The M605 is the radio you buy when one helm isn't enough.

This is Icom's flagship fixed mount, and it shows. The display is a 4.3-inch color screen with roughly a 180-degree viewing angle and a proper night mode — meaningfully easier to read at a glance than the M510's 3.5-inch screen, especially in direct sun or from an awkward angle at the flybridge ladder. If you've ever squinted at a small VHF screen trying to confirm a DSC distress position while the boat's pitching, you understand why that extra real estate is worth paying for.

The real differentiator is stations. The M605 supports up to three control points: the main radio plus two HM-195 CommandMic units, or you can run the RC-M600 command head as a full second display. That means a real helm-and-flybridge setup, or a helm-and-cockpit setup on a sportfisher, where you can transmit, receive, and run the intercom from any station. The M510 supports one CommandMic; the M605 was built for the boat that needs more than that.

The spec rundown:

• 4.3-inch color display, ~180-degree viewing angle
• 25-watt transmit, Class D DSC with dedicated CH70 receiver
• Up to three control stations (radio + 2 CommandMics or RC-M600 head)
• Built-in NMEA 2000 and NMEA 0183
• Built-in GPS receiver
• Optional integrated AIS receiver
• 30-watt hailer/foghorn with listen-back
• Active noise-cancelling

A word on the AIS, because it trips people up constantly. The M605's AIS option is a receiver, not a transponder. It shows you nearby AIS-equipped traffic on the screen, which is fantastic for situational awareness in fog or a busy inlet. It does not transmit your position to other boats. If you want to be seen on AIS, you need a Class B transponder — different box, and we cover that in our guide to the best AIS transponders of 2026. Same caveat applies to the M510's AIS, for the record.

CommandMic wiring is the one place the M605 install gets fiddly. The HM-195 mics run on shielded cable and Icom limits the total run length, so on a big boat with a long pull to the flybridge you need to plan the cable route and may need an extension cable. It's not hard, but it's not a five-minute job either. Budget the wire and the time.

You can check the current flagship configuration on our Icom IC-M605 product page.

Side-by-Side Comparison

Prices are 2026 estimates and move with promotions — check the product pages for the live number.

How to Choose: Four Questions

How many helms do you run?

One helm and the M510 covers it. Two stations — flybridge, tower, cockpit — and you want the M605 for the second and third control points. This is the single biggest factor.

How important is the phone app to you?

If the idea of changing channels and answering hails from your phone while you're up on the bow genuinely appeals to you, the M510 EVO is the only one of the two that does it. The M605 is a traditional hardwired flagship with no app.

How much screen do you want?

Both screens are good. The M605's 4.3-inch panel is just easier to read at a glance and from off-angle, which matters more on a bigger boat where you're not always standing square in front of it.

Do you need GPS in the radio itself?

The M605 has a built-in GPS receiver, so it'll get a DSC position fix even if your NMEA 2000 network is down. The M510 EVO relies on network GPS. On a well-networked boat that's a non-issue, but it's a real redundancy point on a simpler rig. If you're still fuzzy on why that position fix matters, our explainer on DSC on marine VHF radios is worth five minutes.

The Bottom Line

For most single-helm boats under 35 feet, the Icom IC-M510 EVO is the smarter buy — you get a modern radio with NMEA 2000, optional AIS, a genuinely useful phone app, and a shallow case that fits tight helms, for a couple hundred dollars less than the flagship. We put it on more boats than any other premium VHF, and customers don't call back wishing they'd spent more.

Step up to the M605 when you actually need what it does: a second and third station, the bigger screen, and built-in GPS redundancy. On a flybridge sportfisher or a trawler with a cockpit station, it's the right tool and the extra money buys real capability, not just badge.

Buy the radio that fits how your boat is laid out, not the one with the longest spec sheet.

Frequently Asked Questions