OLAS N2K vs OLAS Guardian: Which is Right for Your Boat?

Both the OLAS Guardian and the OLAS N2K do the same essential job: if a crew member goes overboard, they cut the engine and trigger an alarm before the situation becomes a tragedy. But beyond that shared purpose, the two systems are built for very different boats and very different skippers. 

The Guardian is a standalone system, powerful, straightforward, and compatible with almost any vessel. The N2K is an integration device, designed from the ground up to plug into your existing NMEA 2000 network and talk directly to your chartplotter. 

If your boat has a NMEA 2000 network and a chartplotter, the N2K is the better fit as an overall overboard alarm system. If it doesn’t, or you’re not sure, get the Guardian as the best fit as a wireless engine kill switch. The rest of this article explains why. 

 Quick Comparison 

OLAS Guardian: Wireless Safety for Any Boat 

The Guardian was designed to bring wireless engine kill switch technology to as many boats as possible, without requiring any special electronics infrastructure on board. It connects directly to your existing engine kill switch wiring and works out of the box with virtually any outboard or sterndrive engine brand. 

Each crew member wears an OLAS Tag or T2 tag. If they hit the water and submerge the tag, the Guardian triggers the engine cut and sounds a 90dB alarm simultaneously. The OLAS app on your phone receives the alert, marks your GPS position at the moment of the MOB event, and gives your remaining crew a location to navigate back to. 

The Guardian suits powerboats, RIBs, and family cruisers particularly well. If your boat doesn’t have a NMEA 2000 network, or you want the simplest possible installation, it’s the right choice. It’s also a good option if you’re adding safety kit to a second boat or charter vessel, or if you want to start with one crew tag and expand later. Each unit supports up to 25 tags. 

Installation is straightforward. The Guardian hub mounts at the helm and wires directly into the engine’s kill switch circuit. The OLAS app pairs the hub to crew tags over Bluetooth. A typical install takes around 30 to 45 minutes with basic wiring knowledge and needs no network drop cables or backbone splicing. 

OLAS N2K: Deep Integration for NMEA 2000 Vessels 

The N2K is built for the growing number of boats, sailing yachts in particular, that already have a NMEA 2000 network running through them. Rather than operating alongside your existing electronics, the N2K joins your N2K backbone as a network node and communicates directly with everything else on board. 

When a MOB event is triggered, the N2K sends two NMEA 2000 messages into the network simultaneously. The first is PGN 127233, the Man Overboard message, which causes any compatible chartplotter (Garmin, Raymarine, Navico, Simrad, B&G, Lowrance) to automatically set a MOB waypoint and begin guiding the vessel back. The second is PGN 129802, an AIS safety broadcast that emulates the signal of an EPIRB or SART, carrying the vessel’s GPS position when the alert was triggered. 

This matters at sea. In a real MOB event, the first 60 seconds are critical. Having the chartplotter automatically mark the exact position and display a return course, without any crew member having to manually hit the MOB button, can be the difference that saves someone’s life. 

The N2K suits sailboats with a NMEA 2000 backbone, particularly those sailing offshore or racing under class rules that require MOB tracking. If you want MOB waypoints set automatically on your chartplotter, or if you run twin or triple engines connected to a shared N2K network, this is the system to choose.  

To check whether your boat has NMEA 2000, look for a daisy-chain bus running between your instruments, chartplotter, AIS, and autopilot. NMEA 2000 connectors are round, five-pin locking connectors that look like thick audio jacks. If you’re still not sure, check your boat’s wiring diagram or ask your dealer. 

Installation connects the N2K to your existing backbone using the supplied drop cable. The engine kill wire connects to the control switch, and the T2 tag communicates wirelessly with the hub. If you already have a working NMEA 2000 network, adding the N2K hub is no different from fitting a new instrument. Budget 60 to 90 minutes for a clean install. 

Key Differences in More Detail 

Chartplotter integration 

This is the biggest practical difference between the two systems. The Guardian relies on your phone running the OLAS app to provide GPS tracking of a MOB event. That works well, but it requires the phone to be on, unlocked, and in the hands of crew who know how to use it. 

The N2K removes that dependency entirely. The MOB waypoint appears on the chartplotter automatically, visible to every crew member at the nav station or at a second helm display. On a shorthanded sailing yacht at night, in heavy weather, with the skipper in the water, that automatic chartplotter response is worth a great deal. 

Offshore racing requirements 

Most offshore racing categories, including ORC Cat 1, RORC offshore, and Class 40, require either an AIS MOB beacon or an integrated kill switch and MOB alarm system. The N2K’s chartplotter integration means it satisfies the requirements of most race safety rules. Check your specific class rules, but the N2K is the OLAS product that race organisers are most likely to approve. 

Which Should You Choose? 

If you’re still not sure after reading this far, use this table: 

Frequently Asked Questions 

Can I use both systems on the same boat? 

Yes. Some owners fit a Guardian to a tender and an N2K to the mothership, or use the Guardian as a backup system.  

Do I need a smartphone to use either system? 

You don’t need a smartphone for the core safety function. Both systems will cut the engine and sound the alarm independently of any phone. The OLAS app adds GPS tracking, MOB waypoint history, and remote crew management. The N2K’s chartplotter integration also gives you GPS waypoints without needing a phone at all. 

Are the crew tags interchangeable between systems? 

The OLAS Tag and T2 tags are compatible with both the Guardian hub and the N2K hub. If you upgrade from one system to the other, your existing crew tags will work. 

How many crew can each system support? 

Both systems support up to 25 crew tags at one time. Each tag can be individually configured via the OLAS app to trigger engine kill, alarm only, or both. 

The Bottom Line 

Both systems will protect your crew. The question is which one fits your boat and the way you use it. 

If you’re on a sailboat with a NMEA 2000 network, or you sail offshore, the OLAS N2K gives you a level of integration the Guardian cannot match: automatic chartplotter waypoints, AIS broadcast, and native multi-engine support. It’s the better tool for the job on that kind of vessel. 

If you’re on a powerboat, RIB, or any boat without N2K, the OLAS Guardian gives you the same core crew safety in a package that’s faster to install and equally reliable on the water. There’s no reason to add N2K infrastructure to a boat that doesn’t already have it. 

Shop OLAS Guardian     Shop OLAS N2K