ACR OLAS Tag, Four Pack Wearable Bluetooth Crew Tracker The ACR OLAS Tag is a Wearable Crew Tracker that integrates OLAS (Overboard Location Alert System) technology. The ACR OLAS mobile application technology detects a break in its "virtual tether" to the tag within 8 seconds of a Tag going missing. The mobile phone(s) then sounds an alarm and records the latitude and longitude of the incident using the phone or tablet's GPS.ACR OLAS 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. ACR OLAS stores all location data and time of incident required by the rescue services. Activate Solo mode on the app (2G phone signal required) when boating alone and the OLAS app will automatically text message (SMS) your emergency contact with your GPS coordinates in the event you get separated from your boat. Users can track up to 6 different OLAS Transmitters with 1 phone/tablet and each individual OLAS Transmitter can be tracked by an unlimited number of phones/tablets. If you want to track more OLAS Transmitters, add the ACR CORE base station or Guardian Engine Kill Switch and scale your system to monitor up to 15 OLAS Transmitters. The ACR OLAS Tag is a compact, "Smart", man overboard system. It can easily attach to adults, children, pets and objects such as overboard floatation devices or Personal Locator Beacons. It is small and portable and can easily be taken from boat to boat to ensure you are always protected. Each tag is supplied with a universal silicone wrist strap with stainless steel buckle and a pre-installed CR2477 Battery (user replaceable). Start small or go big, the ACR OLAS is the only solution that can scale to meet your boating needs. The range of the ACR OLAS transmitters allows for coverage on vessels up to 40 ft in length. However, the transmitter is part of a larger scalable ecosystem of ACR OLAS products (transmitters and receivers).