General Purpose Man Overboard Systems…

Sea Marshall® SARfinder® GPS plot self-managed man overboard locating system

WHY ARE 406MHz PLBS NO GOOD FOR MOB SAFETY COVER/AUTO-ALERT & LOCATE?
NEW!! Crewguard GPS plot MOB Alerting System
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A low cost alternative… automatic man overboard 'Alarm' Safety System with GPS plot.
  1. Person wearing AU9 falls overboard

  2. Crewguard receives 'SOS' signal, automatically raises alarm, automatically plots GPS position of boat

  3. Boat tracks back to GPS position and if necessary radios Coastguard to report missing person

  4. If outside help is needed, SAR authorities can track missing person on 121.5MHz

The Crewguard GPS plot MOB Alarm system package
...includes the following components:
  • 1 × Crewguard MOB Alarm pre-wired to CREWFIX® NMEA box (for GPS plot)
  • 1 × External Antenna with bracket & 5m of cable
  • 1 × AU9 (LIVE frequency 121.5 MHz)

…the AU9 Alerting Units (PLBs) in this Crewguard® package are available as either 100mW or 500mW (long range) power outputs.
(Tracking range distance graphincs at the bottom of this page illustrate the differences between the two versions)
Please ensure you select the correct product code (AU9 power output) from below at time of ordering

Product Codes
(02-112-S-AU9) 100mW
(02-112-AU9) 500mW
(Prices are listed in the price list...CLICK HERE)

Worn by each of the deck crew… Fitted to the boat…
NEW …. AU9 Man Overboard Alerting Unit Crewguard CG-121 MKII (rev.a) pre-wired to Crewfix® NMEA box
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  • New high power longer range tracking beacon
  • No limit to the number of Alerting Units used in the system
  • No limit to vessel size
  • Very robust, environmentally tested (ED-14F part)
  • IP-68
  • Can be used for diving by adding pressure cap over button (see divers section of this site)
  • Fully Automatic activation with manual over ride
  • Splash activation prevention technology
  • Easy to use and maintain
  • Miniature size
  • User replaceable 5 year battery
  • Self Test facility
  • Automatic Low Battery Warning Indicator
  • LED strobe on antenna
    1. Flashes -RED- 'SOS' continuously when plb is activated.
    2. Flashes -GREEN- on and off to indicate the PLB is ARMED/READY and battery is OK
    3. NOTE- LED automatically flashes on and off -RED- every 15 seconds with a 'BLEEP' when battery is low.
  • Easily Integrated into lifejacket
  • 121.5MHz Integrates with SAR services
  • Test Frequencies 121.65 MHz and 121.775 MHz available
  • USA Approval FCC ID: YFGAU9
  • CE - Approved
  • 100mW and 500mW versions available:
    1. AU9 100mW RRP please refer to Price List.
    2. AU9 500mW RRP please refer to Price List.
Dedicated Man Overboard Alarm Base Unit
  • NEW LED MOB warning indicator
  • NEW heavy duty, waterproof, metal box enclosure.
  • Automatic immediate MOB alerting
  • Easy to operate and install with user friendly controls
  • Waterproof IP-66 display
  • Approximate range indicator (near or far)
  • High quality construction
  • Training Frequencies 121.65MHz & 121.775MHz
  • 12V Power - (24 to 12V DC converter available please refer to Price List.)
  • External Siren included for loud audio MOB alerting
  • Optional external antenna/increased coverage
  • CREWFIX® NMEA GPS output pre-wired in
  • Low cost - used by professionals worldwide
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(for lifejackets with PLB holder pockets built in, click here)
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A simple, highly effective, automatic man overboard alerting Safety System with GPS plot. This system automatically alerts you of a man overboard, recording the GPS position of the incident allowing you to track back to that point. The plbs in this system integrate with SAR services for precise tracking on 121.5MHz should you need extra support.
PLEASE NOTE - the tracking ranges listed are taken from tests where the receiver antenna has been correctly installed at the recommended height with the AU9 correctly installed in either an SMB for divers or lifejacket, with antenna clip for normal use. The SMB gave the maximum range listed as achieved during tests, the lifejacket AU9 installation gave the lower end of the ranges listed. Wearing the AU9 around the neck will reduce the tracking/alerting ranges to below the ranges listed here in.

Alerting Unit Approx Range Distances

...the 500mW version of the Sea Marshall® AU9 has approximately twice the range of the standard 100mW AU9

Alerting Unit Approx Range Distances

‘As used by professionals the world over!’


Disclaimer: Sea Marshall® Alerting Units/MSLDs are an 'Aid to rescue only', they do not guarantee your safety. The Sea Marshall® MSLDs will dramatically increase the chances of detection and location of a Man Over Board. Personal safety remains at all times the sole responsibility of the individual. It is the responsibility of the individual to inform their local Coast Guard, their senior personnel/crew members and or family of their intended location/destination and estimated duration of journey. It is also the responsibility of the individual to notify these people of the type of safety equipment they will be carrying. In the case of accidental activation the user should de-activate the unit and notify the appropriate Search And Rescue Authority.