Active Heave Compensation

AHC Technology

Adaptive Active Heave Compensation for all winches. Increases operational time for ROV and subsea lifting operations.

Active Heave Compensation

Scantrol AHC is an Active Heave Compensation control system for winches, cranes, LARS, wellhead intervention in subsea operations. The system controls the winch to eliminate vessel motion that would otherwise be transferred to the load.

Scantrol AHC includes a MRU (motion reference unit) measuring vessel heave, pitch and roll motion. The system adapts to varying load and operating conditions to maintain safe and efficient compensation without overloading the winches.

Scantrol AHC gives the winch operator precise control over the load, even when operating in rough sea conditions. This results to increased operational time and minimized weather related downtime.

AHC Toolbox

Active Heave Compensation ToolboxScantrol has developed an AHC toolbox that makes it possible to specify AHC requirements and find the optimum winch design to match these. This helps the winch designer to identify critical factors and to minimize power consumption.

The toolbox includes software for data logging and for monitoring of AHC performance.

Flexible solutions

Scantrol AHC is designed to perform safe and reliable Active Heave Compensation with any winch or crane used for subsea operations. The system can also control both electric and hydraulic winches, and will optimize AHC by continuous winch performance analysis.

This system is flexible and can be delivered in different configurations, ranging from a control unit with a simple operator panel or radio control, to an advanced iSYM system with multiple displays and data recorders.

Basic system:

  • iCON AHC controller: A high end real time controller (RTC) with hardware and software dedicated for high speed AHC control, and interface to both electric and hydraulic winches.
  • MRU: Sensor for measuring vessel movement. Pitch, roll, and heave have a very high accuracy of measurement.
  • Operator’s panel: Panel with joysticks and touch screen. The layout and functionality can be adapted according to operational requirements.
  • Radio control: Tailored for safe and reliable winch operation

Advanced Options:

  • iSYM: Crane and Winch Monitoring and Control System
  • Data Recorder: Records winch and vessel data during operation
  • iSYM Online: Remote access for monitoring, support and maintenance
  • Configuration tools: Web interface for setup and test
  • iCON can control all winches and cranes with characteristics suitable for AHC.


AHC brochure


AHC on Wikipedia

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