The OLAS EXTENDER effectively increases the length of the ‘virtual tether’ which exists between the OLAS transmitters (OLAS Tag and OLAS Float-On) and the OLAS Receiver (OLAS CORE, OLAS GUARDIAN,). Users on vessels up to 80 ft. in length can therefore now enjoy the comfort in knowing that within 2 to 4 seconds (depending on which OLAS receiver is in use) of a transmitter going missing, all synced receivers (excluding the EXTENDER which is solely used for extending the range of coverage of your OLAS system) will sound a loud audible alarm to alert crew of an MOB incident. In conjunction with the audible alarm(s), the ACR OLAS Mobile App records the latitude and longitude of the incident using the phone or tablets GPS, then aids the crew with the MOB recovery, clearly directing them to the GPS location where the MOB occurred with clear visual signals and bearing data.