McMurdo, UK, has selected the low power Fastrax IT310 GPS receivers for new AIS SART devices.
Beacons use GPS data to locate their accurate position and transfer the range and course to survivors to standard AIS displays onboard nearby ships.
The AIS SART technology (Automatic Identification System Search And Rescue Transmitter) was adopted into the carriage requirements of the International Maritime Organisation (IMO) as of January 1, 2010, as a new alternative to the traditional radar-based SART.
McMurdo's first AIS SART product, the Smartfind S5, utilises the highly sensitive and low power consuming Fastrax IT310 GPS receiver to quickly determine an accurate position of survival craft.
The compact-sized Smartfind S5 is mounted on ship bridges, survival craft and life rafts, and packed inside a quick release carry off bag for quick evacuation. Once activated, it transmits alert messages including its geographic position and identity number for a minimum of 96 hours.
The location is updated every minute, with four messages transmitted on AIS 1 and four on AIS 2. All eight messages are transmitted within a total time frame of 14 seconds. This time frame is designed to maximise the probability that one of the transmissions will coincide with the AIS SART being at the top of a wave, so enhancing the probability of reception.
It is only necessary to receive one of the eight messages from time to time to accurately locate the AIS SART.
"Emergency location beacons require positioning technology that reliably provides accurate location data in challenging conditions, with low enough power consumption to ensure adequate operation time", said John Norrish, New Product Specialist of McMurdo.
"Power consumption of an AIS SART beacon is dominated by the GPS receiver, and the Fastrax IT310 GPS receiver module stood out from the competition with its low power drain. Fastrax also offered us valuable insight and advice in the design and development process, working with us to optimise GPS performance."
Designed for navigation systems and battery operated devices, the Fastrax IT310 is based on SiRFStarIII LPx chipset. The low-power design is further enhanced with configurable power management, which makes it one of the lowest power consuming OEM GPS receivers on the market.
The minimal power drain allowed McMurdo to use a smaller battery while still meeting the required 96-hour operating time, and to produce a lighter and more conveniently sized product for easier mounting.
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