Lost Diver Locating System

Sea Marshall® AU9 'SOS' transmitter with pressure rated to 75m depth



Egyptian Customer information
NTRA Approval
NTRA Sea Marshall Approval
WHY ARE 406MHz PLBS NO GOOD FOR MOB SAFETY COVER/AUTO-ALERT & LOCATE?
How much do you value your life?
A Sea Marshall® lost diver beacon works out at £0.62 per week over a 5 year period which is the life of the unit. A full spec Sea Marshall® diver locating system for a party of 4 can work out from as little as £9.00 per week over 5 years. For the cost of a meal you can protect yourself and three others with a professional level self managed safety system. Can you afford not to?
Lost Diver LOCATING system with GPS Plot
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...This is a full self managed lost diver/diver in distress locating system which allows the dive boat to quickly respond to an SOS alert from a diver. Time saves lives. This system is perfect for dive clubs and dive tour operators who want to provide the highest level of safety cover for their members and customers. The Alerting Units (plbs) in this system can be used on their own to provide safety cover for divers moving from boat to boat. [watch this video]

The Sea Marshall® Lost Diver Locating System is made up of the following components, priced individually...

  1. AU9 Alerting Unit personal locator beacon (with pressure cap fitted)

  2. Surface Marker Buoy (with pocket for AU9)

  3. SARfinder® (GPS plot) locator unit…includes 1 × live and 1 × test frequency AU9 (PLB)

Carried by diver
ALERTING UNIT - Sea Marshall® AU9 digital personal locator beacon (with pressure cap fitted can be used for diving)
  • 24/7 monitoring of crew/Divers
  • Small and comfortable to wear
  • Easy to activate
  • Long range homing signal on 121.5MHz
  • Can be tracked by SARfinder® or Coastguard/Military
  • Robust marine construction (environmentally tested)
  • Depth rated to 75m with pressure cap fitted
    (tested to 140m fresh water)
  • Pressure cap included
  • User replaceable battery + auto low battery indicator
  • Gives confidence to you and your crew
  • USA Approval FCC ID: YFGAU9
  • CE - Approved
  • 100mW and 500mW versions of AU9 available
AU9 100mW
Live Frequency Unit - AU9 100mW LIVE-121.5MHz
Test Frequency Unit - AU9 100mW T1 121.65MHz
Test Frequency Unit - AU9 100mW T2 121.775MHz

AU9- 500mW (recommended for Divers)
APPROVED BY EGYPTIAN GOVERNMENT FOR RED SEA DIVING
Live Frequency Unit - AU9 500mW LIVE-121.5MHz
Test Frequency Unit - AU9 500mW T1 121.65MHz
Test Frequency Unit - AU9 500mW T2 121.775MHz

please refer to Price List.


Marker Bouy
'SOS®' Surface Marker Bouy for AU9 PLB
  • Manufacturer recommends the AU9 is fitted to SMB when used for Diving = increased tracking monitoring range

When attached to a line it allows the AU9 to be deployed from sea bed to raise the alarm on the surface…even if the boat is miles away, the 'SOS' signal will cause the SARfinder locator unit on the boat to ALARM, telling the crew an emergency has taken place and, they will then be able to quickly track the 'SOS' signal coming from the PLB.

Product Code – (08-002-S-AU9)
Price – please refer to Price List.
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  1. Diver carrying AU9 fitted to SMB dives

  2. Diver gets into difficulty on seabed

  3. Diver deploys SMB with AU9 activated and transmitting 'SOS' signal

  4. SARfinder® on dive boat picks ups 'SOS' signal and tracks to diver’s location to recover diver

AU9 pouch
Useful neoprene pouch for storing your unit between dives - please refer to Price List.

  • AU9 unit roles up and fits inside for storage
  • Useful clip for attaching to jacket
  • Belt loop on the rear
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Locator unit fitted to dive boat
BASE UNIT - Sea Marshall® SARfinder®1003 man overboard Alarm/Locating unit with GPS plot

  • NEW heavy duty metal enclosure
  • NEW more compact robust antenna and connectors
  • Monitors for & tracks 'SOS' signal from AU9
  • Automatic Alert/Alarm of lost diver/man overboard
  • Plots GPS position of boat at time of incident
  • Long distance tracking of 'SOS' signal from AU9
  • Easy to read LED compass style display
  • Allows you to quickly locate a missing person(s)
  • Gives confidence to you and your crew and customers
  • Comes with 2 AU9 units
    • 1 × LIVE 121.5MHz
    • 1 × TEST 121.65MHz

    …the AU9 Alerting Units (PLBs) in this SARfinder® 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

    SARfinder1003 MKII MOB Locating Unit + NMEA CREWFIX, c/w AU9 T1- 121.65MHZ & AU9 LIVE 121.5MHZ
    Product Codes
    (02-002-NMEA+AU9) 100mW
    (02-002-NMEA+AU9) 500mW
    (Prices are listed in the price list...CLICK HERE)
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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.