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#81
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Useful gadgets
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#82
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Useful gadgets
Dave wrote:
"Armond Perretta" said: Who said anything about "submerged"? I did. To make a point. Rather effective, no? You snip better than Rumsfield/Bush, "Dave." Let's review the bidding. The uncensored version of the exchange is: quoted Dave wrote ... Armond wrote ... Dave wrote: "Armond Perretta" said Dave wrote: Armond wrote: Any person who regularly operates ... without radar in ... decreased visibility (and I include ... darkness in this category) is ... taking the position that "its up to the other guy to avoid me." As to darkness, nonsense. That's why vessels have running lights. When was the last time you saw a rock with running lights ... ? When was the last time you saw a submerged [sic] rock on radar? ... Who said anything about "submerged"? I did. To make a point. Rather effective, no? /quoted It is left as an exercise for the reader to determine the effectives of this form of logic. Good sailing to ya, "Dave." -- Good luck and good sailing. s/v Kerry Deare of Barnegat http://kerrydeare.tripod.com |
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#83
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Useful gadgets
Dave wrote:
"Armond Perretta" said: Who said anything about "submerged"? I did. To make a point. Rather effective, no? You snip better than Rumsfield/Bush, "Dave." Let's review the bidding. The uncensored version of the exchange is: quoted Dave wrote ... Armond wrote ... Dave wrote: "Armond Perretta" said Dave wrote: Armond wrote: Any person who regularly operates ... without radar in ... decreased visibility (and I include ... darkness in this category) is ... taking the position that "its up to the other guy to avoid me." As to darkness, nonsense. That's why vessels have running lights. When was the last time you saw a rock with running lights ... ? When was the last time you saw a submerged [sic] rock on radar? ... Who said anything about "submerged"? I did. To make a point. Rather effective, no? /quoted It is left as an exercise for the reader to determine the effectives of this form of logic. Good sailing to ya, "Dave." -- Good luck and good sailing. s/v Kerry Deare of Barnegat http://kerrydeare.tripod.com |
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#84
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Useful gadgets
steve, no one talking here about the radar on military ships. we are talking
about the radar on recreational sailboats. go back to sleep. then how come you are such a dumb squat when it comes to radar? I probably spend more time as radar observer, on my week off, than you do in a year. indeed, you didn't even know you need nearly flat water to see low rocks with radar, as witness your statement below: That may have been true in the 40's and 50's. It's not true anymore. There are all sorts of techniques modern radars use to find things like low rocks in sea clutter, from simple ones like scan averaging and doppler filtering to complex adaptive filters which model the sea clutter and remove it. Steve |
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#85
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Useful gadgets
steve, no one talking here about the radar on military ships. we are talking
about the radar on recreational sailboats. go back to sleep. then how come you are such a dumb squat when it comes to radar? I probably spend more time as radar observer, on my week off, than you do in a year. indeed, you didn't even know you need nearly flat water to see low rocks with radar, as witness your statement below: That may have been true in the 40's and 50's. It's not true anymore. There are all sorts of techniques modern radars use to find things like low rocks in sea clutter, from simple ones like scan averaging and doppler filtering to complex adaptive filters which model the sea clutter and remove it. Steve |
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#86
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Useful gadgets
Jack Dale wrote in message . ..
On 24 Jan 2004 09:18:25 -0800, (Parallax) wrote: Any other useful things? Portland Plotter - after one of my coastal navigation students showed me one I put away the parallel rules. I still like a Douglas protractor, but I use the parallel rules as an antique. The Plotter is my mainstay. After I demonstrate all 3, almost all of my students opt for the Portland Plotter. Jack Portland Plotter? I'll do a search on it. I hate the parallel rules because they are hard to use with the chart spread on a pitching cabin floor. Instead I use my hand bearing compass mounted to aplastic square I can align with north and perpendicular to the edge of the chart. I have a protractor mounted to it so I can rotate it about the compass axis. Works for me. Around here, in most cases, i can ignore the difference between magnetic north and true north. I seriously considered the Fujinon 10X50 binocs with internal compass but decided that I have never wanted to take a bearing on anything with binocs so bought the ones without the compass. So, I still use my trusty Suunto hand compass (the kind with the mirror) that has lasted through many caving and sailing trips. |
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#87
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Useful gadgets
Jack Dale wrote in message . ..
On 24 Jan 2004 09:18:25 -0800, (Parallax) wrote: Any other useful things? Portland Plotter - after one of my coastal navigation students showed me one I put away the parallel rules. I still like a Douglas protractor, but I use the parallel rules as an antique. The Plotter is my mainstay. After I demonstrate all 3, almost all of my students opt for the Portland Plotter. Jack Portland Plotter? I'll do a search on it. I hate the parallel rules because they are hard to use with the chart spread on a pitching cabin floor. Instead I use my hand bearing compass mounted to aplastic square I can align with north and perpendicular to the edge of the chart. I have a protractor mounted to it so I can rotate it about the compass axis. Works for me. Around here, in most cases, i can ignore the difference between magnetic north and true north. I seriously considered the Fujinon 10X50 binocs with internal compass but decided that I have never wanted to take a bearing on anything with binocs so bought the ones without the compass. So, I still use my trusty Suunto hand compass (the kind with the mirror) that has lasted through many caving and sailing trips. |
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#88
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Useful gadgets
those who can't, teach,, and those who can't and can't teach, are Jaxz!
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#89
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Useful gadgets
those who can't, teach,, and those who can't and can't teach, are Jaxz!
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