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#1 | |
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#3 |
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#5 | |
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#6 | |
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You are Funny Seadoo. I presume by your screen name that your mode of nautical transportation is a Seadoo...or shall we say JetSki. No problem there. To each his own. My own background is as follows..In Brief: I sailed my own boat to Bermuda and back..Singlehanded, in 1979, and did it again in 1981. I used Celestial Navigation. There was no GPS then and LORAN "C" was only coming on line in it's infantsy. I have followed modern navigation developments since then and GPS WORKS. It doesn't matter how much you pay for GPS...the only thing different is "Features". The accuracy is pretty much the same. SO: YES: I think I know what I'm talking about. |
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#7 | |
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also congrats on sailing you own boat to bermuda and back, and singledhanded wow you must feel great! The funny thing about all the computers that run our lives is that they misread data and sometimes are worse then boating the "old" way, using land points around the water ways to help one get from point A to point B. Regaurdless on what GPS system one is using they still do fail more so in the rain and stormy weather, as it was that night. |
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#8 |
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#9 |
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rain, moisture, fog, heavy cloud cover (any atmospheric condition that is "conductive") can attenuate RF. So it isn't necessarily a matter of "failing", but a degradation that may result in less frequent positional updates due to weak(er) signals. In the extreme, yes, loss of signal could occur which would render the device inoperative.
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#10 |
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I know my Garmin has a hard time "Locating Satellites" when it I turn it on if there are storm clouds and rain; but it eventually comes on-line. It sometimes messages "Waiting for Better Accuracy" if it is really cloudy.
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#11 | |
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Without WAAS, accuracy can be as much as 100 meters off and I have personally seen this inaccuracy on my GPS. I have rarely loss total GPS / satellite signal however. GPS is a another extra wonderful tool to HELP with navigation but should never be relied upon totally. It is NOT fail proof and it is never 100% accurate. Dan |
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#13 |
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Can you imagine being on the boat that night if a false GPS reading was indeed the cause of the accident?! Holy Christ! Stop and think about it for a second...try to put yourself there.
Cruising along, happy to be with good friends, and laughing about the prank you had just pulled. Maybe a small "glow on" from a beer or three (come on now, we've all been there) trusting your GPS in the fog and rain, because, well, it has never failed you before, not once. Blasting along, but keeping a close watch on your GPS screen, staying right on course, and then out of nowhere, AN ISLAND! Way too late to do a darn thing, except thing, "Wow, this really going to suck!" |
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#14 | |
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IMO, anyone who needs a TV screen to navigate at night needs to stay off the damn water. GPS, especially on a small inland lake, is a sanity check, not an auto pilot. So, no, I cannot picture the scene you describe because there is no way I would EVER trust an electronic device to guide me in close quarters at speeds that could cause harm to vessel or person if it malfunctioned.
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#15 |
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Another thing you should keep in mind about GPS accuracy. The DOD owns and operates the Global Positioning System. in case of an attack on the US govt. DOD can and will change the gps algorithm. This is too confuse the enemy/attacker(s) if they use GPS for tracking their 'smart' ammunitions.
A buddy od mine who serve in the Armed Forces told me this little tidbit. If your GPS goes crazy we must be under attack! ![]()
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#16 |
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#17 | |
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You say you cannot picture (imagine) the scene I describe? Do you lack an imagination? How do you watch TV, Movies, or read books???? |
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#18 | |
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Could I "imagine" it from the perspective of another person, yes, of course. Could I imagine myself in that scenario? Not really?
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#19 | |
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![]() I understood what you meant sa meredith and yes I agree if that were ever to happen I could imagine the boater being scared to death... if they survived the impact. |
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#20 |
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Yes, of course it is wrong to be cruising along, with your head buried in a screen...or even really NEEDING the screen in the first place. No one could argue against that. Wrong and dangerous.
I was simply sharing an image that popped into my head. Not trying to start any trouble. |
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#21 | |
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There is no substitute for first hand knowledge of the lake and a good current chart. The GPS is as stated in other posts a nice double check, but can't be the primary means of getting around at night. You need your head up, your night vision, and a strong ability to navigate using any visible landmarks and nav aides. If you can't, you shouldn't be on the water at night - you are risking not only your life but everyone else in the area's as well. |
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#22 |
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I use GPS to fix my position at night and then constantly check against what I can see. For example, if the GPS says I should be approaching a flasher I locate that flasher and lock on to it visually until I can locate my next point of reference. If my visibility is compromised the first thing to go is SLOW DOWN! probably to headway speed until I can obtain another visual fix.
In essence, when traveling at significant speed I can always see my next visual marker AND I can always confirm my position on GPS. If I lose confidence in either I slow down until I am confident in both again. I also use a general compass heading as confirmation. I know that heading home is generally a N heading and check that every now and then as well. |
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#23 | |
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I use a similar technique when night boating. You must use all the data you can when boating in limited visibility. That means your eyes, and your GPS or radar (if equipped). I also use my depth finder. If the GPS says it should be 50 feet deep and my depth finder says 20 feet, I slow down figure out what going on. Usually its the depth finder whacking out on something. You have to be a fool not to use all the tools you have, none of them are perfect, all of them can give you false data once in awhile, even your own eyes. |
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#24 | |
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Obviously, some folks have a deep felt dislike of all things electronic, while others believe 100% in them. But I think most of us have a valuable cynicism that understands what you just stated. Our own eyes can betray us sometimes just as a GPS can. It pays dividends to understand that, and proceed with caution. |
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#25 | |
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I guess we'll hear eventually of any GPS involvement in this collision: It's my understanding that a GPS can record the passage it has taken.
Quote:
When Googling the book's availability, results included night-vision (Coast Guard .pdf files), and then to invention. The Dutch have apparently invented night-vision imagery that makes night appear as though "shot in broad daylight"—in full color! Will technology introduce still another screen to the helm that will make "heads-up" night boating obsolete? What a concept! ![]()
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#27 | |
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There are many reasons why things like GPS and LORAN-C should be considered navigational AIDs and not replacements for familiarity with the water you're operating in.
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#28 |
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OK I guess... I've never had it happen to my Standard Horizon in any cloud cover whatsoever, or rain. I also had a hard time finding evidence of failure of GPS in rain and clouds online. I'll take your word for it that it has happened to you though.
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#29 |
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I have had issues with my Standard Horizons (I have had the CP155C, CP175C and currently have a CP180I) in the past on crappy nights. It does happen. Sometimes they have problems acquiring a link in inclement weather.
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#30 |
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While all of this talk of GPS accuracy and anomalies is fascinating we must all remember one thing:
Regardless of GPS, RADAR, compass, depthfinders or the like a captain, at all times, must maintain a proper lookout. Maintaining a proper lookout is one of the most basic rules of seamanship that everyone must master and understand before taking the helm. Failure of an installed navigational aid, or the inability to interperet such aid accurately is never an excuse for not maintaining a proper lookout, or operating your craft at an appropriate speed with regards to surrounding water & atmospheric conditions! |
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#31 |
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#32 | |
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#33 |
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Had an airplane with GPS in it. Have thousands of hours IFR and hundreds flying in the rain and the GPS never failed (due to the rain). We have Direct TV and it has been known to fail during heavy rain and thunderstorms.
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#34 | |
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Maybe she was "flying on instruments".... |
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#35 | |
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