An electronic visual distress signal can be a useful part of a layered safety plan, but UK boat owners should understand the difference between recognised distress alerting equipment and visual locating equipment.
The first question is not which product is brightest. It is what your vessel is required to carry. Commercial vessels and some recreational craft have specific equipment requirements. Where approved pyrotechnic flares are mandatory, the current MCA position is that EVDS cannot simply replace them.
The relevant UK guidance is MCA Marine Information Note 542 Amendment 3. It remains important to check the latest guidance because regulations and approval routes can change.
A strong marine safety plan usually uses more than one method. An alerting device such as VHF DSC or an EPIRB can tell rescuers that help is needed and can provide position information. Visual signals then help identify the casualty when a lifeboat, helicopter or nearby vessel is approaching.
The RYA describes EVDS as potentially useful for location, particularly in the final mile, while noting that they are not currently listed as internationally recognised distress signals under COLREG Annex IV. See the RYA EVDS guidance.
GPS coordinates can take a rescue asset close to the casualty, but the final visual identification can still be difficult. Darkness, sea state, spray, background shore lighting and multiple vessels in the area can make a small target hard to distinguish. A conspicuous visual signal can help bridge that gap.
A rechargeable electronic signal can be functionally tested before departure and can operate without the storage and disposal issues associated with pyrotechnic devices. Those advantages do not change its regulatory classification, but they can make it useful as additional equipment.
Equipment suitable for a short coastal passage may not be enough for offshore use. Consider distance from help, communications coverage, weather, crew experience, vessel type and the requirements that apply to your operation.
Our guides to what an EVDS is and visual location in the final mile explain these roles in more detail.
Last reviewed: October 2026. This is general information, not regulatory advice. Always check current MCA and vessel-specific requirements.