Aeronautical & General Instruments Ltd (AGI): Marine Instrumentation


 AGI is pleased to introduce our second generation AGILOG Electromagnetic (EM) Speed Log System (AGILOG 2) following on from the unprecedented success of it's predecessor. Developed for use on surface warships and submarines, AGILOG sets the standard for accurate and reliable measurement of ship’s speed through the water, an essential element in navigation and weapons system integration.

The EM technology provides reliable and robust speed availability when compared to some alternative technologies. AGILOG 2 provides dual axis speed measurement, with multiple RS422 serial outputs and Ethernet interfacing built in.
AGILOG's international reputation stems from over 40 years of experience in the design and manufacture of ship’s log systems for over 40 other navies worldwide. Covering all classes of vessels – from nuclear and conventional submarines, aircraft carriers and frigates, to fast patrol boats, mine-hunters and fleet support ships
As well being certified to Mil-Std 461 & 810 for naval applications, the system complies with the requirements of IEC 61023 & IEC 60945, the internationally approved specifications for marine speed and distance measuring equipment and general marine navigational equipment.



EM2000 is a cost effective, highly reliable and accurate electromagnetic (EM) speed log having a wide range of applications, from ocean-going merchant and passenger ships, to coastal patrol craft for police or customs use. The system complies with and is wheelmarked to specifications IEC 61023 & IEC 60945, the internationally approved specifications for marine speed and distance measuring equipment and general marine navigational equipment

EM2000 is founded on the well proven electromagnetic principle that a voltage is induced in a conductor by a moving magnetic field. A sensor attached to the hull of the vessel produces an electromagnetic field, by using the water as the conductor. An output is generated as the vessel progresses, relative to the ship’s speed through the water. The system provides a reliable and robust output, which is unaffected by water aeration that can affect alternative technologies.



AGIMET uses the latest proven solid-state meteorological sensor technology specially designed for the marine environment to provide accurate measurement of wind speed and direction, temperature, pressure, humidity and other local environmental parameters.

The system employs solid-state ultrasonic wind sensors, proven to be more accurate and reliable over time than its mechanical cup and vane counterpart, thus providing through life cost savings
In addition the AGIMET system incorporates features specifically designed for naval ships to enhance wind measurement accuracy to aid safe flight operations and effectiveness of the weapons and decoy systems.
Information is transmitted digitally, simplifying data handling and in many cases alleviating the need for dedicated re-transmission units. When ship’s speed and heading are inputted, true wind data is calculated and provided as an output. The system, when combined with AGI’s extensive range of repeaters, provides distribution and display of many meteorological and navigation parameters.



Utilising modern COTS equipment qualified to naval military standards, the digital Moriah Wind System (MWS) has been developed to replace the Type F Windbird Sensors, Data Distribution equipment and Displays on all classes of US naval ships, enabling accurate wind information to be displayed in the same format throughout the fleet.

MWS is a solid-state system with no moving parts, so providing a highly accurate, reliable and low cost of ownership system, which is ideal for supporting ship based aviation activities. The system comprises of 1 to 5 Solid State Wind Sensors, Dual Redundant Processor Unit, a range of Multi-Function Color Displays (8.4”, 10.4” and 15.0”) and utility Software/Graphic User Interfaces. In addition full Meteorological capability can be achieved with the inclusion of Air Temperature & Humidity, Air Pressure and Sea Temperature Sensors

The MWS is based on AGI’s AGIMET Naval Wind Measurement and Meteorological System, which is proven and in service with many navies worldwide. The MWS has been expanded to provide greater capability for data distribution, alleviating the need for dedicated re-transmission units. The design is highly modular and has spare capacity for plug-in RS422 modules, LAN modules and Synchro modules, together with spare memory and processor power, which allows for future system expansion, upgrades and refits.



A Ships Helicopter Operational Limit (SHOL) diagram is a polar plot of acceptable relative wind speed and direction conditions considered safe to conduct helicopter flight operations from a ship's deck. Other parameters such as sea state, pitch and roll are also considered in the decision to launch or recover a helicopter. Traditionally a printed-paper SHOL would be used and the commanding officer would have to manually plot wind information on the SHOL diagram, having collected data on ship's motion and wind conditions from a variety of sources.


AGI has developed a cost effective electronic Ship Helicopter Operational Limits Display System (SHOLDS), which automates this process and provides the crew with dynamic up-to-date information on wind and ship's motion, superimposed on the SHOLDS software package. The system will then provide a green (GO) status if the conditions are within the pre-defined limits or a red (NO-GO) if outside the limits, therefore minimising the workload on the ship’s crew and keeping manning levels to a minimum
If the conditions are outside of the acceptable wind condition limits, the system can calculate and recommend alternative ships course and speed. This function is commonly referred to as FC (Flying Course or Fox Corpen). SHOLDS is an extension of the meteorological systems AGIMET and MORIAH developed and manufactured by AGI Ltd. For further details on SHOLDS please see Application Note & Datasheet available in the downloads section.



The Universal Data Distribution System is designed to collect, process and prioritise a range of data for distribution on naval ships. The system has a flexible modular architecture and can therefore provide a cost effective solution for data distribution on various platforms from patrol craft to frigate classes.

A ship's system can range from a single Universal Data Processor Unit (UDPU) to multiple units, which may be deployed around the ship at different locations to suit the specific data integrity needs of the platform. Dual Ethernet Fibre Optic links between units provides for high data carrying capacity and low data latency, and is very efficient in minimising ships cabling. Each UDPU can be provided with single or dual processors for redundancy. Data produced is available to sub systems via Ethernet, serial RS422 or Synchro (60Hz or 400Hz) interfaces.

The UDPU and associated hardware have been fully qualified to military environmental standards and are based on systems which have been in service with the US Navy since 2003, providing processing and dissemination of wind and other navigation data for various different classes of naval vessels. Please contact AGI to see how your data distribution requirements can be cost effectively met using our proven technology.

Data collected and distributed includes ships heading, speed, distance, roll, pitch, wind, meteorological, depth, GPS, Time etc, from multiple sources.



The Multi Function Colour Repeater (MFCR) provides a high-resolution colour display suitable for complex graphics data, with designs available for both military and civil applications. Available in 8.4, 10.4 or 15 inch industry standard sizes, the MFCR incorporates a built-in processor to process and display many navigation and meteorological parameters. The units are configurable during installation with either a fixed single page of data or multiple pages, thus providing initial as well as through-life cost savings.

This flexibility allows a common repeater to fulfil different roles at different positions on board ship or other vehicle. A single MFCR is able to replace up to 20 traditional dedicated repeaters, leading to major cost and space savings. A large range of standard navigation and meteorological pages are available from AGI, a customisation service is also available where pages may be designed with customer input to meet a particular bespoke requirement.



The AGI monochrome LCD repeaters have a fixed single page design available to display a variety of parameters including Ship’s Speed & Distance, Roll, Pitch, Heel, Trim, Heading, Depth, Wind Speed & Direction, Temperature, Humidity and Pressure.

The units are designed and manufactured to military standards using a high degree of common parts, therefore minimising the spares requirements. The displays are configured to suit the particular application by adjustment of firmware and the addition of alternative printed scales where necessary

In most cases the data may be displayed in either digital only or both analogue and digital formats. Analogue providing ‘at a glance’ trend information and digital providing precise information. Each display uses high reliability transflective liquid crystal displays (LCD) with fully dimmable backlighting, ensuring maximum readability in a wide range of ambient conditions.



The AGI Tape Heading Repeater is based on the moving tape principle. A large format array of Light Emitting Diodes (LED) is used to simulate a moving compass card image past a fixed pointer. This type of display with over 1500 pixels provides excellent rate of change data to the user in a clear unambiguous format. The display also includes a separate digital representation of the data, using 4 seven-segment characters. Features of the Tape Heading Repeater include audible rate of turn, dual gyro input and zoom facility.


A master/slave repeater can be used to minimise system cost on platforms which have synchro heading data. Both master and slave repeaters have a dual input capability for interfacing to one or two separate sources of gyro data.



For further information on AGI products contact  Owen International.