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#1
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Radar - attitude changes
On Mon, 28 Sep 2009 09:39:08 +0200, Marc Heusser
d wrote: In article , "Denis M" wrote: After this summer cruise I concluded that I needed to replace my radar reflector. An active one will work wonders. And (active) AIS is an even better option, provided you are aware that only vessels over 500 tons are mandatorily fitted with one. This will even give you the equivalent of MARPA. HTH Marc Those big boats can (and do) filter out all signals from AIS-B transponders to reduce clutter on their display. You may see them, but they still don't see you. |
#2
posted to rec.boats.cruising
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Radar - attitude changes
wrote in message ... On Mon, 28 Sep 2009 09:39:08 +0200, Marc Heusser d wrote: In article , "Denis M" wrote: After this summer cruise I concluded that I needed to replace my radar reflector. An active one will work wonders. And (active) AIS is an even better option, provided you are aware that only vessels over 500 tons are mandatorily fitted with one. This will even give you the equivalent of MARPA. HTH Marc Those big boats can (and do) filter out all signals from AIS-B transponders to reduce clutter on their display. You may see them, but they still don't see you. Very true, when a target is showing on the radar. I use MARPA's information and contact the vessel with DSC. This way (hopefully) the vessel or radar base can identify me with my MMSI number and get my GPS position on their screen. In theory this is how it should work. I practice it's a difference story. Most of the foreign ships have not had their personnel trained to use DSC yet! When practicing with friend I can track their GPS positions and they can track me without problems. |
#3
posted to rec.boats.cruising
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Radar - attitude changes
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#4
posted to rec.boats.cruising
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Radar - attitude changes
"Marc Heusser" d wrote in message ... In article , wrote: Those big boats can (and do) filter out all signals from AIS-B transponders to reduce clutter on their display. You may see them, but they still don't see you. If they do - they are at least at a legal disadvantage should a collision happen. An argument to fit an AIS-A transponder :-) In this case an active radar reflector would be better, as it cannot be filtered. Marc -- remove bye and from mercial to get valid e-mail http://www.heusser.com An active radar reflector is the way to go. The only problem is it takes electrical power. Power boats with a large generator have no problem. The next best thing for a sailboat is an adequate passive radar reflector. I am looking at the Tri Lens Radar Reflector. It is always best to know the traffic on or close to your route. This is best done when you are planning your route. When this is not possible I check for traffic with the Coast Guard. Over here we use Fundy and Halifax Traffic I visited their office and they have the latest of equipment and land base radar antennas all around the Bay and the gulf of Maine. When entering narrow passages under heavy fog I prefer to make my self known by being in radio contact with the traffic dept and the vessels in my vicinity. |
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