Magnetic Field Sign

Magnetic Field Sign – ISO 7010 Warning Symbol HS0023

This Magnetic Field sign warns crew and visitors that equipment producing a strong magnetic field, such as a compass calibration station, degaussing coil or magnetic testing device, is present in the marked area. It follows the internationally recognised ISO 7010 warning pictogram format, showing a horseshoe magnet with field lines on the standard photoluminescent yellow triangle so this hazard reads instantly regardless of the reader’s first language.

As SKU HS0023 in the Hazard Signs range, it is built for continuous marine exposure and suits compass platforms, degaussing equipment rooms, magnetic testing bays and any compartment where a strong magnetic field could affect nearby equipment or personnel.

The pictogram shows a black horseshoe magnet with curved field lines radiating from its poles, rendered inside the warning triangle, a graphic used consistently to flag magnetic hazards without needing a field strength reading.

Because a magnetic field is invisible and can affect pacemakers, magnetic storage media, ferrous tools and sensitive navigation equipment without any obvious warning sign, the sign functions as the primary alert that something in the area behaves differently to the rest of the ship. The photoluminescent base keeps this warning visible for a period after lighting fails, relevant for compartments visited during rounds when lighting may be limited.

Why Magnetic Field Marking Matters

A strong magnetic field can interfere with a pacemaker, erase magnetic storage media, pull ferrous tools unexpectedly, or throw off nearby compass and navigation readings, none of which are obvious until the interference has already occurred.

Standardised magnetic field signage warns crew and visitors to remove loose ferrous items and sensitive electronics before entering, and it supports the vessel’s compass and navigation equipment integrity by marking areas where calibration or degaussing work is carried out. It also protects contractors and visiting technicians who may be carrying tools or devices that a magnetic field could damage or disturb.

Compliance and Certification

This sign is produced to align with IMO shipboard safety signage guidance and the ISO 7010 graphical symbol set used to flag magnetic hazards across the maritime and industrial sectors, supporting the ISM Code’s requirement for documented control of equipment-specific hazards affecting navigation and personal safety. A visible magnetic field warning at compass platforms and degaussing stations is a documented control that classification surveyors and internal safety auditors look for when reviewing navigation equipment integrity.

Installation Recommendations

Mount the sign at eye level at the entrance to any compartment housing magnetic field equipment, and post a secondary reminder near the equipment itself if pacemaker-wearing visitors or contractors are a realistic possibility. Use the pre-drilled fixing holes with marine-grade fasteners for exterior and workshop bulkheads, and the self-adhesive backing for interior cabinets and equipment housings. Confirm during navigation equipment audits that this sign remains in place and has not been removed during compass adjustment work.

• 425 x 425mm rigid or self-adhesive format for steel, aluminium or GRP surfaces
• Photoluminescent base for visibility during power loss or blackout drills
• UV-stable, saltwater-resistant construction for long-term exterior exposure
• Self-adhesive or pre-drilled fixing options for fast, secure installation
• ISO 7010 compliant horseshoe-magnet pictogram, language-independent and instantly recognisable

Order the HS0023 Magnetic Field sign today to mark every compass platform and degaussing station before your next navigation equipment audit. Safety Sign Hub stocks the complete IMPA/ISSA-coded hazard sign range and ships marine-grade signage across Australia and to vessels in port, with bulk pricing for fleet orders.

See the full Hazard Signs range for related ISO 7010 warning pictograms, or browse our Fire Fighting Signs for IMO A.654(16) fire control signage to complete your vessel’s safety signage plan.