Safety onboard: Addressing alarm fatigue
Seafarers worldwide face growing challenges with shipboard alarm systems. On some vessels, thousands of alarms per day create dangerous alarm fatigue, turning the management of constant alerts into a full-time task during critical operations.
Alarm fatigue describes the situation where a ship’s crew becomes ‘numb’ to alarms. Instead of supporting safe operations, alarm systems can become a source of distraction, disruption, and risk. Analysis by Lloyd’s Register (LR), based on 40+ million alarm events, shows that many alarms provide little operational value, disrupt rest, and push crews toward unsafe workarounds.
Alarm overload at sea
Ships generate thousands of alarms daily. LR analyzed 11 vessels over 2,000+ operational days, reviewing more than 40 million alarm events, and found:
- Many alarms provide little or no operational value
- Fewer than 50% of vessels meet the benchmark of <30 alarms/hour
- Cruise ships recorded up to 2,600 alarms/day and 4,691 alarms in 10 minutes
- On some vessels, alarms disrupted 63% of crew rest periods
- Addressing the top 10 most frequent alarms could reduce total alarm load by ~40%
As maritime operations become more digital, the challenge of alarm overload is growing, affecting everyday life and safety on board ships, Lloyd’s Register highlighted.
Every alarm is meant to help. But when there are too many, too often, it becomes difficult to know which ones to act on. That’s when crew, passengers, and cargo can be put at risk. Our research shows a 197% increase in alarms on board ships over the past two decades. This isn’t just a statistic—it’s a warning signal.
… said Asger Schliemann-Haug, Lead Data Scientist at the Technical Directorate, Lloyd’s Register.
Effective alarm management isn’t just about reacting to alerts. It’s about empowering watchkeepers with the right information at the right time, so they can prevent abnormal situations from occurring or escalating.
Because the right alarm at the right time can save lives—and that’s a sound we all need to hear.
Karen Cowie, Asset Management Lead, Lloyd’s Register Advisory added.
8 Tips for seafarers for effective alarm management
# 1 Don’t ignore, understand
Always try to identify the cause before acknowledging. Avoid routine “click-through” responses
#2 Focus on what matters
Give priority to critical and safety-related alarms. Don’t let nuisance alarms distract you from key risks
#3 Manage alarm fatigue
Stay aware of desensitisation during busy periods. Take short mental resets when possible to maintain focus
#4 Report nuisance alarms
Flag repetitive or low-value alarms to senior officers/engineers. Help improve the system for the whole crew
#5 Fix, don’t bypass
Avoid silencing or bypassing alarms unless properly authorised. Push for root cause fixes instead of temporary workarounds
#6 Use logs & handover notes
Record recurring alarms and share during watch handovers. Build awareness across the team
#7 Communicate & escalate
Speak up if alarms are overwhelming or unclear. Escalate concerns when safety may be affected
#8 Trust, but verify
Use alarms as a support tool, not the only source of awareness. Cross-check with visual cues and system readings
Alarms are there to help, but only if used properly. Crew awareness, communication, and feedback are key to making them effective.
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