Choosing the Right EVDS: A Guide to Standards, Performance and Use
Electronic Visual Distress Signal Devices (EVDS) are designed to deliver a conspicuous, standardised SOS signal. Choosing well means focusing on verifiable performance and recognised standards, most notably RTCM 13200.0, which defines colour, pattern, brightness, endurance and environmental robustness for compliant EVDS.
Step 1: Confirm Compliance
Start with the standard. An EVDS that is compliant to RTCM 13200.0 has been tested for luminous intensity, colour (dual-colour Red/Orange and Cyan SOS pattern), pattern accuracy, operating time and environmental durability.
Step 2: Assess Visibility
- Brightness: Check that the stated luminous intensity is verified by test data.
- Colour: Ensure output falls within the approved Red/Orange and Cyan chromaticity ranges for conspicuity at sea and at night.
- Pattern: Look for a defined, repeatable SOS sequence maintained across the device’s rated runtime.
Step 3: Check Runtime and Power
Longer, verified runtime increases the chance of detection. Confirm the tested duration with the specified battery type and operating mode. User-replaceable batteries support field readiness and easier maintenance.
Step 4: Review Construction
Inspect ingress protection (IP) rating, corrosion resistance and housing design. Marine-ready devices should tolerate impact, immersion, vibration, salt spray and temperature extremes without degrading performance.
Step 5: Consider Ergonomics
Prioritise simple, glove-friendly activation, clear labelling and practical mounting options. Accessories such as brackets or lanyards help secure the device for stable, visible operation in rough conditions.
Step 6: Verify Documentation
Ensure the product includes operating instructions, maintenance guidance, and warranty terms. Availability of replacement parts and support materials indicates a well supported product.
EVDS Checklist
- Compliant to RTCM 13200.0
- Verified brightness and approved colour output
- Accurate, repeatable SOS pattern
- Proven runtime on the stated batteries
- Appropriate IP rating and corrosion resistance
- Clear labelling and user guidance
- Useful accessories (mounts/lanyards) available
- Reliable technical support and warranty
Summary: Pick an EVDS with documented RTCM 13200.0 compliance and a robust marine build. That combination delivers confidence, endurance and reliability, precisely when you need them most.