EPIRB/SART work in these latitudes but the processing time is increased. Because there is no Inmarsat coverage, there is no Safety NET. But Iridium has been approved in . GMDSS. Activated correctly they Point searcher in the right direction increasing your chances of being rescued. SART stands for search and rescue transponder. It is an active device, meaning it transmits a signal to draw attention to itself. It's triggered when it detects a pulse from a radar as soon as it does. It transmits multiple pulses straight How Does Synthetic Aperture Radar Work? Synthetic aperture radar is a way of creating an image using radio waves. The radio waves used in SAR typically range from approximately 3 cm up to a few meters in wavelength, which is much longer than the wavelength of visible light, used in making optical images. SEARCH AND RESCUE PROCESS. 1. Distressed mariner/outdoor adventurer/pilot activates beacon (EPIRB, PLB, ELT). 2. Beacon transmits a 406 MHz emergency message containing your Unique Identifier Number (UIN) to the LEOSAR (polar orbiting) and GEOSAR* (geostationary) satellite systems. 3. The satellites relay the 406 MHz emergency message to a .

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