Monitoring systems › Helideck and Aviation Monitoring › HMS Rev 9.2 No
Standard · Norway
HMS Rev 9.2 No: Helideck monitoring standard (Norway)
The Norwegian sector standard for helideck motion and weather data measuring equipment, agreed between Offshore Norge and the helicopter operators and published as Appendix K of the Offshore Norge 074 Helideck Manual.
What is HMS Rev 9.2 No?
HMS Rev 9.2 No, formally Standard Measuring Equipment for Helideck Monitoring System (HMS) and Weather Data, sets out how helideck movement and weather conditions are measured, displayed and reported on the Norwegian Continental Shelf (NCS). Its purpose is uniform readings and registration across installations.
It is the Norwegian counterpart to the HCA HMS standard used under CAP 437 in the UK. The standard is valid on the NCS as mandated by the Offshore Norge helideck manual, and its basic requirements build on BSL D 5-1, ISO 19901-1:2015, NORSOK C-004 and NORSOK T-100.
When is a helideck “moving”?
A helideck on a floating unit, such as a vessel, FPU, semi-submersible or floating jack-up, is treated as a moving landing area if pitch or roll exceed 1°, and the heave amplitude exceeds 2 m and/or the heave rate exceeds 0.3 m/s.
What the 2024 revision changed
The 29 September 2024 issue of Rev 9.2 No keeps the 2017 calculation methods and adds four clarifications and requirements:
Real-time data sharing
All HMS data shall be made available for sharing in real time with the helicopter operators. This is a new requirement.
Roll axis clarified
The roll axis is parallel with the vessel heading, not with the helideck heading.
Vessel heading for landing
The vessel shall be manoeuvred 30° out of wind to improve visual cues during landing and take-off.
Semi-submersible categories
Semi-submersibles in helideck categories 2 and 3 are now included in the operational limits table.
Official documents
Offshore Norge 074 Helideck Manual, Appendix K
HMS Rev 9.2 No is published as Appendix K of the helideck manual. The current manual is revision 05, dated 1 October 2026.
BSL D 5-1
The Norwegian regulation for the use of offshore helidecks, which sets the basic requirements the standard builds on.
Key HMS requirements
The standard covers helideck classification, operational limits, accuracy, verification, motion and weather data, and the display. The main points for an HMS are:
Helideck categories
Three categories based on the floating unit’s size, configuration and visual cues, with limits for pitch, roll, inclination and significant heave rate. A unit without working measuring equipment is downgraded by one category.
Accuracy
Pitch, roll and inclination better than ±0.1° RMS over 0 to 3.5°, and heave rate better than ±0.1 m/s RMS over 0 to 1.3 m/s. Meteorological accuracy follows ISO 19901-1:2015.
Verification
Initial and periodic in-field verification by a trained, certified field service engineer, with motion verification at least every 3 years and verification data kept for at least 3 years.
Significant heave rate
Calculated as 2 × RMS of the instantaneous heave rate over a moving 20-minute window, sampled at 2 Hz or more and updated at least every minute.
Weather data
Wind speed in knots and direction relative to magnetic north, with real-time, 2-minute and 10-minute values. Visibility, temperature and dew point, QNH and cloud, with 30 days of logged data.
Display
Layouts approved by the helicopter operators, showing which HMS standard the system complies with, and a traffic light for roll, pitch, inclination and SHR.
How WISE Group supports HMS Rev 9.2 No
Built for the Norwegian sector
We deliver and support helideck monitoring systems for units operating on the NCS, with a DADAS HMS software version built to Rev 9.2 No. We support offshore operators with:
- Complete HMS for moving helidecks: motion sensors, weather sensors, displays and repeater lights
- DADAS HMS configured to the Rev 9.2 No limits, calculations and display requirements
- Real-time sharing of HMS data with the helicopter operators
- In-field verification, calibration and maintenance across the lifecycle of the system
Helideck standards
Related standards
CAP 437
The UK CAA standard for offshore helidecks, and the international benchmark.
Read the overview →NorwayBSL D 5-1
The Norwegian regulation for the use of offshore helidecks.
Read the overview →BrazilNORMAM-223
The Brazilian Maritime Authority standard for helidecks in Brazilian waters.
Read the overview →Global · currentHCA Rev 9c
The HCA standard for HMS and weather data on moving helidecks.
Read the overview →HMS Rev 9.2 No
The Norwegian sector standard for HMS and weather data, Appendix K of Offshore Norge 074.
You are hereQuestions about HMS Rev 9.2 No?
Whether you are moving a unit onto the NCS, upgrading an existing HMS or preparing for verification, our team can tell you what the standard means for your installation.
Useful to include
- The unit and its helideck category
- The HMS and revision installed today
- When the next verification is due
Read HMS Rev 9.2 No at the source
The standard is Appendix K of the Offshore Norge 074 Helideck Manual.
Prefer to talk it through?
Our helideck team can walk you through what Rev 9.2 No means for an existing or planned installation.
Get in touch
Tell us about the helideck and what you need to know. You can also contact us directly.