What Are ECDIS Back-Up Requirements?

Introduction

Navigating modern ships isn’t what it used to be. Gone are the days when we’d pore over paper charts with pencil and dividers for hours. Today, most of us rely on ECDIS—the Electronic Chart Display and Information System—to guide vessels safely across the world’s oceans. But what happens if the ECDIS system fails while you’re mid-voyage, miles from land?

That’s where ECDIS back-up requirements enter the picture. As a seafarer myself, I’ve seen how crucial these regulations are—not just for avoiding delays, but for ensuring everyone’s safety on board. Whether you’re a deck officer, a cadet, or even a superintendent overseeing ship equipment, understanding ECDIS back-up systems is absolutely essential.

In this post, I’ll break down what these back-up requirements are, why we need them, and how to ensure your vessel remains compliant according to IMO regulations and classification society rules.

What is ECDIS and Why Does It Need a Back-Up?

ECDIS stands for Electronic Chart Display and Information System—a digital navigation system that displays electronic navigational charts (ENCs) and integrates data from GPS, AIS, radar, and other ship systems. It’s become the industry standard for navigation, replacing paper charts on many vessels.

But as powerful as ECDIS is, it isn’t infallible. Like all electronics, it can fail due to:

• Software errors
• Hardware breakdown
• Power loss
• Virus or cyber-attack
• Malfunctioning GPS or position inputs

Imagine being in a congested waterway or approaching port when your navigation display suddenly goes dark—that’s a nightmare scenario for any mariner! That’s why the International Maritime Organization (IMO), under SOLAS regulations, requires a reliable back-up for ECDIS.

Who Sets the Requirements for ECDIS Back-Up?

The rules governing ECDIS and its back-up arrangements are set by the IMO under SOLAS Chapter V Regulation 19. Classification societies, flag states, and shipowners must ensure their vessels comply. For specific vessel types, routes, and flag requirements, it’s best to check with the relevant national or classification authority (such as ABS, DNV, or the UK Maritime and Coastguard Agency).

When Did ECDIS Back-Up Become Mandatory?

The SOLAS amendments making ECDIS mandatory were phased in from 2012 to 2018 for various vessel categories. Since then, most SOLAS vessels – from tankers to container ships – must have ECDIS plus a back-up. If you’re sailing on any vessel of 500 GT and above engaged in international voyages, these rules likely apply to you.

What Are the Main Back-Up Requirements for ECDIS?

SOLAS Regulation V/19.2.1.4 states that vessels must carry “an appropriate back-up arrangement to meet the functional requirements of this subparagraph (ECDIS back-up).” But what does that mean in practice?

There are two main options:

• A Second (Independent) ECDIS – This is the most common solution. The back-up ECDIS must:
  • Be fully operational and independent
  • Display up-to-date electronic navigational charts (official ENCs) for the entire voyage
  • Have a separate power supply and inputs (position, sensors, etc.) from the main ECDIS, or at minimum, separate processors
• Updated Paper Charts for the Full Voyage – Some ships, especially those transitioning to digital, keep a full set of updated paper charts onboard. This:
  • Must cover the intended voyage and alternate routes
  • Needs to be updated and corrected as new Notices to Mariners are received
  • Requires bridge crew proficiency in traditional chartwork

Most modern vessels opt for dual ECDIS setups, but smaller ships or those on exempted routes may use paper charts as the back-up.

Key Points for ECDIS Back-Up Arrangements

• Back-up ECDIS must be approved by the flag state and classification society.
• It should be ready for immediate use without complex setup or installation.
• All charts on the back-up ECDIS or paper folios must be as current as those on the primary ECDIS.
• Navigators should be trained and familiar with both the main and back-up systems.

How Do You Ensure ECDIS Back-Up Compliance On Board?

This is where good seamanship and solid routines make all the difference. Here are my personal tips, drawn from many years at sea:

• Regularly test both ECDIS units. “Set it and forget it” isn’t an option—switch to the back-up now and then to check all functions.
• Keep software and charts updated on both systems. Failing to update one ECDIS could leave you exposed if the main unit fails.
• Train your bridge team in quick changeover procedures. Drills and familiarization should be part of routine bridge training.
• If using paper charts as back-up, update regularly. Assign clear responsibility for chart corrections, and make sure all officers can navigate this way.
• Review flag and class requirements before sailing, especially when transferring ships or sailing under new flags. Regulations vary by country.

I remember an incident on one of my previous vessels where a software glitch shut down our main ECDIS near the Singapore Strait. Because we’d practiced switching to our back-up, the handover was seamless, and we continued the voyage safely—proving just how crucial a reliable back-up can be.

Penalties and Consequences of Non-Compliance

If a vessel doesn’t comply with ECDIS back-up requirements, it could face:

• Detention and fines from port state control
• Insurance implications in case of grounding or collision
• Voyage delays and operational headaches

But more than that, there’s the risk to human life and the marine environment—something we all take seriously in this industry.

Frequently Asked Questions (FAQ)

Q: Is having two ECDIS units always mandatory?
A: Not always. For some vessel types or trades, paper charts can serve as the specified back-up, provided they meet all requirements and are kept updated. Always check your flag state’s guidance.

Q: Can a second ECDIS share inputs (GPS, gyro) with the primary?
A: Ideally, each ECDIS should have its own power and data source, but in practice, many ships use shared sensors through a redundant network. However, both must be independently operable if one fails.

Q: Are there standard training requirements for ECDIS and back-up use?
A: Yes. Both the IMO Model Course 1.27 (See IMO official model courses) and many flag states require officer training and type-specific familiarization.

Conclusion: Why ECDIS Back-Up Is Not Just a Formality

At the end of the day, ECDIS back-up requirements aren’t just another checkbox—they’re a lifeline when something unexpected happens at sea. As technology becomes more central to navigation, redundancy is your safeguard against those rare but dangerous failures.

To sum up:

• Always have a working, approved ECDIS back-up—whether electronic or on paper.
• Keep all systems updated and all crew trained and ready.
• Check your vessel’s specific IMO, flag, and class requirements each voyage.

Stay alert, stay compliant, and remember: good seamanship means always being ready for the unexpected.

For more information, always refer to the latest IMO and flag state regulations.

Safe sailing and fair winds!

Tags: ECDIS, ECDIS backup requirements, SOLAS navigation, IMO ECDIS regulations, electronic navigation, ECDIS compliance, dual ECDIS, paper chart backup, bridge team training, maritime safety standards