boatlink.net

Always-on connectivity for boats — messaging, telemetry and tracking that follow the hull, not the dock.

A reference on connectivity for recreational and small commercial boats — the onboard data buses, the link options and the data model that bridges them.

boatlink.net covers connectivity for recreational and small commercial boats — the onboard buses, the available link types and the data models that bridge them into a coherent boat-to-cloud channel. The page is an editorial primer: the framing target is the boat that already has NMEA 2000 below deck and a phone in the helmsman's pocket, and that needs a clear way to push either of those signals to a destination of the owner's choosing.

The economics of the segment have shifted sharply in the last few years. Low-earth-orbit broadband at sea is now affordable to small operators in a way it was not three years ago, and at the same time cellular signal at coastal cruising distances has improved. The combination opens the door to an integration layer that hides the link choice and gives the owner a consistent telemetry, messaging and tracking surface across whichever physical link the boat happens to have at that moment. Iridium Short Burst Data remains the resilient floor for global telemetry where neither cellular nor LEO is available.

The glossary above sets out the underlying vocabulary — NMEA 2000, AIS, low-earth-orbit, SignalK, Iridium SBD — that any small-craft connectivity discussion has to handle. Each term has a procurement, regulatory or technical meaning at boat level that differs from larger commercial vessels. Readers approaching this topic from an electronics installer, owner or integrator background will find the terms here match the conventions used by chartplotter vendors and marine connectivity providers.

Key terms

NMEA 2000

A controller area network bus standard used to interconnect marine electronics on a single vessel.

How Devices speak fixed-format messages across a shared twisted pair backbone, addresses are negotiated dynamically, and a single bus carries depth, position, engine and battery data from a handful of competing vendors.

Why NMEA 2000 is the de facto wiring of modern recreational and small commercial boats, and any cloud-bound telemetry product has to read from that bus rather than reinvent it.

AIS

Automatic Identification System, a VHF-based transponder protocol broadcasting vessel identity, position and course.

How Onboard transponders broadcast on dedicated VHF channels, shore receivers and satellites collect the broadcasts, and aggregators republish the data with seconds-to-minutes delay.

Why AIS is the cheapest source of vessel position data globally and underwrites most third-party tracking products, so any boat-connectivity offering has to position itself relative to AIS.

Low-earth-orbit

A class of satellite constellation operating below roughly 2000 km altitude, providing lower-latency links than geostationary satellites.

How Hundreds or thousands of satellites in inclined orbits hand off connections as they pass, ground stations relay traffic to the public internet, and user terminals see latency closer to terrestrial than to traditional satellite.

Why LEO services have lowered the cost of usable broadband at sea for small boats by an order of magnitude over the last few years, which changes the economics of every small-craft connectivity product.

SignalK

An open-source data model and HTTP API for marine sensor and instrument data.

How A vessel server normalises NMEA and proprietary feeds into a JSON tree, web and native apps consume the tree over HTTP and websockets, and integrators publish or subscribe without writing per-bus parsers.

Why SignalK is the lingua franca that lets a third-party telemetry product talk to a boat without negotiating with every electronics vendor individually, so it is on the critical path for cloud-bound products.

Iridium SBD

Short Burst Data, a low-bandwidth message service operating across the global Iridium satellite network.

How A small modem transmits binary payloads up to a few hundred bytes, the network forwards them by email or HTTP, and replies follow the same path with seconds-to-minutes latency.

Why SBD is the floor of usable global telemetry for small boats because the modem cost and per-message cost stay low even outside cellular coverage, and many tracking products are built on it.

Frequently asked

What is boatlink.net?

boatlink.net is the topic surface for small-craft connectivity — the onboard data buses, the link options available to recreational and small commercial boats, and the data model that ties them into a single boat-to-cloud channel.

Why does SignalK matter on a small boat?

SignalK is an open-source data model and HTTP API that normalises marine sensor and instrument feeds into a single JSON tree. Without it, every telemetry product has to negotiate with each electronics vendor on the boat individually; with it, a vessel server exposes one consistent surface and integrators can subscribe through HTTP or websockets. It is on the critical path for any modern boat-to-cloud product.

What did low-earth-orbit broadband change for small craft?

LEO services such as Starlink Maritime have lowered the cost of usable broadband at sea for small boats by roughly an order of magnitude over the last few years. The motion-tolerant antennas are within reach of recreational budgets, the latency is closer to terrestrial than to geostationary satellite, and the economic case for cloud-bound telemetry on a small boat now stands up on its own.

How can I get in touch about boatlink.net?

Email [email protected] for editorial corrections, topic suggestions or partnership ideas relating to small-craft connectivity.

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