Raymarine LifeTag is a wireless crew monitoring and man-overboard alert system. Utilizing the latest in RF (Radio Frequency) wireless technology, the Raymarine LifeTag base station can monitor up to 16 different Raymarine LifeTags simultaneously. In the event a tagged person falls overboard, the RF link between tag and base is broken, and an onboard audible alarm is sounded. The Raymarine LifeTag system will also activate if a tag moves out-of-range of the base station (typically 35 feet.) Raymarine LifeTag (.pdf)
Tags within range of the LifeTag base station, exchange status messages to indicate that each crew member is safe, or within range. If a person falls overboard, immersion in saltwater rapidly degrades the signal which is detected by the base, sounding an alarm to alert the crew. Additionally, an alarm is sounded if a crew member moves away from the boat for a distance of 35 feet or more.
LifeTag can also be manually activated by pressing and holding the red man overboard (MOB) button for three seconds and then releasing. SeaTalk compatibility enables LifeTag to activate MOB mode exclusively on Raymarine multifunction displays, chartplotters and ST290 instrument systems.