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It will continue sending distress signals 4 times a minute. I fall overboard, my inflatable PFD inflates, 15 seconds later an AIS distress signal is sent. In the meantime, the crew (likely your wife) is on the boat trying to get it under control and copying the coordinates and entering them into the chart plotter, while remaining calm and collected so she doesn't make an error. And now, assuming no transcription errors, the boat can begin navigating to the distress location. In the meantime, if any boat has heard the distress signal, they are trying to copy down the coordinates and then enter them into the chartplotter or gps to see the location of the distress call. The USCG will wait almost 3 minutes before responding, and they will call the station sending the distress signal to inquire about the emergency. All DSC enabled radios that are turned on receive the message and the coordinates. At water level I hit the DCS panic button and the radio sends out a distress message and the GPS coordinates.
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I fall overboard and manage to remain conscious and to hold onto a handheld VHF. Coverage plots assume a mobile transmitter power of 1 watt or greater at sea level over water."īy the way, the MOB1 transmits the DSC signal at 0.5 Watts and the AIS signal at 1 Watt, according to its documentation. "Charts showing predicted areas of VHF National Distress System coverage can be downloaded in. There is also a similar page that shows the Canadian coverage. (I personally dislike inflatable PFDs but that's a subject for another thread.) One nice feature of the HX890 is that it has a strobe light that is enabled on contact with water to help locate you.Īnyway, here is a URL that has links to US Coastguard DSC coverage maps. I wonder if it also activates with a non-inflatable PFD. The MOB1 will automatically start sending a distress call when an inflatable PFD is activated. They both have built in GPS's, transmit at 5 Watts (m93d) and 6 Watts (HX890) and cost approximately $200 each. While it is true that the MOB1 device is smaller, the Standard Horizon HX890 and the Icom m93d are not too bigĪt all. By the way, how did you know the signal you saw was not someone pressing the panic button on a DSC enabled VHF and not a MOB1 device? Or maybe the MOB signal was sent by the mothership or someone else repeating the distress signal. To ensure easy emergency access, the WS4938 includes a neck strap and a multifunctionĬlip that can be mounted in a convenient location or worn on a belt.Click to expandAnyway, I believe the panic button on a newer DSC enabled VHFs essentially do the same thing as the MOB1 device, but at a considerably higher transmitting power.
DSC PANIC BUTTON FULL
The WS4938 features intuitive activation via a large, clearly defined button that incorporates a full two second delay to help reduce false alarms.
DSC PANIC BUTTON PORTABLE
With DSC’s wireless WS4938 single-button personal panic, users are given a portable means to call for help from anywhere in the home.
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