Building a Bulletproof Comms Plan for Your Next Ocean Passage

There's a moment on every bluewater passage when the last bar of cell signal vanishes from your phone and you realise you're truly on your own. Or are you? How you stay connected across an ocean has changed dramatically in recent years, and choosing the right communications setup is one of the most consequential decisions you'll make before casting off.

The Case for HF/SSB Radio

High-frequency single-sideband radio has been the backbone of offshore communication for decades. An SSB set with a good antenna tuner and backstay antenna can reach thousands of miles, pulling in weather faxes, joining cruiser nets, and sending compressed email through services like SailMail and Winlink. For many sailors, the morning SSB net remains the heartbeat of the cruising community—a place to share positions, swap weather observations, and relay urgent messages when a fellow boat is in trouble.

The real strength of HF radio is its one-to-many broadcast capability. A single call on a cruiser net reaches every boat within propagation range. In an emergency, a Pan-Pan or Mayday on 2182 kHz or the offshore calling frequencies can summon help from any vessel monitoring the band—not just a shore-based call centre. That community safety net is something no satellite device can fully replicate.

However, SSB isn't without its drawbacks. A quality marine HF installation—transceiver, antenna tuner, ground plane, and modem—can run well north of $5,000. The learning curve is steep. Propagation is fickle, especially during solar cycle peaks when HF bands can go quiet for hours. And the global network of coastal radio stations that once provided reliable ship-to-shore links has largely disappeared.

Satellite: Simpler, But at a Price

Satellite communications have become the default choice for a new generation of cruisers. Devices like the Iridium GO! exec offer a compact, battery-powered hotspot that turns your phone or tablet into a satellite terminal. Voice calls, SMS, basic email, and even compressed weather GRIB files are available anywhere on the planet through the Iridium constellation's pole-to-pole coverage.

The appeal is obvious: no licensing exam, no antenna tuner calibration, no propagation anxiety. You press a button and you're connected. For couples and short-handed crews who don't want to spend watch hours debugging a Pactor modem, satellite is a revelation.

But the costs add up. Hardware aside, monthly airtime plans for Iridium or Inmarsat can run anywhere from $75 to several hundred dollars, depending on your data appetite. And satellite is inherently point-to-point—you can call one person or send one email at a time. There's no equivalent of the morning SSB net where sixty boats share information simultaneously.

Winlink: The Best of Both Worlds?

For amateur radio operators, Winlink bridges the gap between HF and the internet. Using your SSB transceiver with a VARA HF or Pactor modem, Winlink routes email through a global network of volunteer gateway stations. You can send and receive email, request weather data through Saildocs, and even file position reports—all without spending a cent on airtime.

The catch, of course, is that Winlink operates on amateur bands and requires a ham licence. Commercial traffic—including anything that could be construed as conducting business—is prohibited. But for cruisers who hold a licence, Winlink provides a remarkably capable and cost-effective email system that works across every ocean.

Building a Layered Comms Plan

The smartest approach isn't choosing one system over another—it's layering them. A well-equipped bluewater boat might carry an SSB transceiver for nets and emergency broadcasts, an Iridium device for reliable point-to-point communication and weather downloads, a handheld VHF for close-range work, and an AIS transceiver for collision avoidance and position tracking.

Redundancy is the key word. Satellites fail, solar storms disrupt HF propagation, and batteries go flat at the worst possible moment. If your only link to the outside world is a single device, you're one equipment failure away from radio silence. Carry at least two independent systems that operate on different technologies, and make sure every crew member knows how to use each one.

Before your next passage, sit down and think through your communications needs. Who do you need to reach, how often, and how much data do you need? A transatlantic couple sending daily position reports has very different requirements from a rally fleet needing real-time weather routing. Match your systems to your mission, build in redundancy, and you'll cross oceans with the confidence that help—and home—is always within reach.