tag:blogger.com,1999:blog-8438349299382644702.post6505566703203791649..comments2024-01-16T00:58:22.388+11:00Comments on Snowpetrel Sailing: Sextants and GPS Take IIBenhttp://www.blogger.com/profile/05436730113185275906noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-8438349299382644702.post-28314057083391870012011-02-14T11:22:58.760+11:002011-02-14T11:22:58.760+11:00The reply from chris and follow on comment from me...The reply from chris and follow on comment from me can be seen at <br /><br />http://brilliantstarcruises.net/2011/02/13/sharing-a-conversation-on-gps-anomalies/#comment-24<br /><br />Thanks again ChrisBenhttps://www.blogger.com/profile/05436730113185275906noreply@blogger.comtag:blogger.com,1999:blog-8438349299382644702.post-35799365970215731072011-02-13T20:51:56.552+11:002011-02-13T20:51:56.552+11:00Hi Chris, Thanks for the interest, In fact I have ...Hi Chris, Thanks for the interest, In fact I have never had an outage like that.. the most I have ever seen is a couple of hours of erratic behavour (this was many years ago), and occasional one off jumps out of position by a mile or so for about 30 seconds (mostly around high land or Ice). <br /><br />I assumed the first was due to a rogue satelite and the second due to reflected signals, but would be very interested in your thoughts on these.<br /><br />Of course I have had individual units and ariels die, but getting out the spare soon fixed that.<br /><br />I guess I was wondering if you had any viable reason that would justify carrying a sextant rather than a whole batch of spare GPS units. Other<br /><br />Cheers<br /><br />BenBenhttps://www.blogger.com/profile/05436730113185275906noreply@blogger.comtag:blogger.com,1999:blog-8438349299382644702.post-59047300385908714442011-02-13T01:20:59.938+11:002011-02-13T01:20:59.938+11:00Ben, thanks for the comment on Piracy. Joshua woul...Ben, thanks for the comment on Piracy. Joshua would need bigger tacks these days.<br /><br />Can you send me the date and time (UTC) of your GPS (non) event and a rough lat lon. I may have some thoughts for you.<br /><br />Ive been involved with GPS since 1973.<br />Chris<br />Brilliant StarAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-8438349299382644702.post-15466596662217886172011-02-10T10:52:04.843+11:002011-02-10T10:52:04.843+11:00Hi John, Good to hear it is a good sextant and tha...Hi John, Good to hear it is a good sextant and thanks for your reply. It is interesting how GPS has taken over our lives, I remember a second trip Navigation Cadet not knowing how to put a radar position on the chart, we had just cleared the hamburg fairway bouy and he wanted to put a gps plot down...(but then the old timers would say why are you using radar, use the compass...) another one put a gps fix down in the middle of the suez canal, but he got a good ribbing for that. I guess the old timers have disapproved of things like this since the compass was invented.. or maybe even before.. (that fire thing you light at night will make you soft)<br /><br />CheersBenhttps://www.blogger.com/profile/05436730113185275906noreply@blogger.comtag:blogger.com,1999:blog-8438349299382644702.post-65775872758844814032011-02-10T10:17:17.513+11:002011-02-10T10:17:17.513+11:00Hi Ben,
I have, and still carry, exactly the same...Hi Ben,<br /><br />I have, and still carry, exactly the same sextant. It's really is a great instrument and has helped me make many a landfall. Now if I could just remember how to use it!Johnhttp://www.morganscloud.comnoreply@blogger.comtag:blogger.com,1999:blog-8438349299382644702.post-76560126728332790092011-02-09T13:14:01.751+11:002011-02-09T13:14:01.751+11:00I guess The Americans could push the Selective Den...I guess The Americans could push the Selective Denial button and disable civilian GPS in an area near you, to maybe confuse some pirates or something, or wage a war.. but I think I would prefer to keep well clear of those waters anyway, I also suspect they would turn it on and off as they did in the first gulf war with Selective Availability rather than leave it off completely, This should enable you to get a fix every day or so. They may also degrade the signals or put in an error, but you should still be able to find land.Benhttps://www.blogger.com/profile/05436730113185275906noreply@blogger.com