How to Design a Future-Proof IT Network for Vessels

IT onboard doesn't stand still

Here's a scenario we see more often than we should: a vessel built in 2014 running navigation software from 2020, connected via a VSAT setup that barely manages 2 Mbps on a good day or is blocked and congested, with crew sharing a single guest Wi-Fi network that competes with the ship's operational systems. The captain wants to do a remote video call with the port agent. The engineer needs to download a software update for the main engine monitoring system. And a crew member decides now is the time to be streaming a video.

Nothing works properly and the IT manager back at HQ gets a frustrated call at 2am!

We've seen this kind of setup dozens of times. The problem isn't the technology. It's that nobody ever designed the network with the next ten years in mind. This article is for anyone who has come across this and is interested in our experiences.

Why vessel IT networks age badly

Ship IT networks get built for a specific moment in time. The problem is that vessels last 20-30 years, but the technology they need to run efficiently changes every 3-5 years. The other issue is that networks on ships often grow organically. A new system gets added without anyone stepping back to look at the whole picture. You end up with a "patchwork" that nobody fully understands and nobody wants to touch.

Add to that the fact that maritime IT budgets are usually tight and you've got a recipe for networks that limp along until they genuinely break.

The three-layer framework

When we assess a vessel's IT setup, we at Pentonet look at three layers:

• Connectivity — How does data get on and off the ship? What's the primary link, what's the backup, and how are they managed? This is where GEO, 5G, VSAT, and L-band all come into play.
• Infrastructure — Once connectivity is on the ship, how does it move around? Switches, routers, VLAN segmentation, Wi-Fi coverage. This layer is often neglected or entirely ignored.
• Applications and monitoring — What's running on the network, how is traffic prioritised, and can you see what's happening remotely? This is where SD-WAN and remote monitoring tools live.

Most vessels have only thought carefully about layer one and ignored layers two and three. That's usually where the problems are.

What to prioritise when budget is tight

Not every ship needs the same thing, and not every upgrade needs to happen at once. Here's how we'd think about it.

• Fix the redundancy first. A vessel with no backup connectivity is a single antenna failure away from going dark. Even a basic Iridium Certus L-band connection as a backup changes the risk profile completely.
• Separate operational and crew traffic. These should never be on the same network. It's a security risk and a performance issue. Proper VLAN segmentation costs effectively nothing if you have decent hardware.
• Get visibility. If you can't see what's happening on your network remotely, you're flying blind. Invest in a monitoring tool before upgrading bandwidth. You might find out you don't need more bandwidth, you just need better traffic management.

Signs your network needs an upgrade

• You're regularly running above 80% capacity on your primary link
• You have no backup connection
• Crew and operational systems share the same network
• You can't monitor or manage the network remotely
• Your hardware is more than 5 years old
• You've had unplanned downtime in the last 12 months due to connectivity

What future-proof actually means

Future-proof doesn't mean buying the most expensive kit today. It means designing a network that can evolve where you can swap out the connectivity layer without rebuilding everything else, where you have proper segmentation that won't need to be redone when you add a new system, and where you have visibility into what's happening so you can make smart decisions.

It also means thinking about what your vessels will need to do in five years. Remote diagnostics. Real-time data to shore. More crew applications. These things need bandwidth and reliability that most current setups can't deliver.

Not sure where your fleet stands? Request a free assessment at sales@pentonet.com