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Search took 0.00 seconds. Search: Posts Made By: transmitterdan
Forum: Marine Electronics 18-01-2015, 06:12
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

When I watched the VW video it appeared the first hint the crew had something was wrong is the sound of breaking surf. Several crew run to the port side looking into the dark trying to figure out...
Forum: Marine Electronics 16-01-2015, 05:34
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

Fatigue is a more likely cause of the VW grounding than electronic charts. Hubris is also a candidate. These two affect all of us at one time or another. If our brains were wired correctly we...
Forum: Marine Electronics 15-01-2015, 20:09
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

Both times I had a plotter. First time was my first real boat and I wasn't looking at the plotter. Secon time I thought I knew the route so didn't turn on the helm plotter. But the one down below was...
Forum: Marine Electronics 15-01-2015, 18:32
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

I've run aground (couple of times) but it wasn't the chart plotter's fault.
Forum: Marine Electronics 15-01-2015, 18:31
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

One of the things I like is "going places" on my charts. But I could never afford paper charts (well I could but I can't justify it) for all the places I can go to on my laptop for free.

And the...
Forum: Marine Electronics 15-01-2015, 17:23
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

There are probably 10 things the navigator (or skipper) of VW could have done that would have prevented the grounding. So how can we who are not involved be certain of a particular one as the root...
Forum: Marine Electronics 15-01-2015, 17:12
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

That is a lot of thread drift Van. I am not offended that you surmised that. But you are reading into it something that isn't there. I fully understand your point about wanting to put work behind...
Forum: Marine Electronics 14-01-2015, 16:53
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

Jon,

Maybe it's the electronic chart you are using. This is what OpenCPN shows on a CM-93 chart of that area. Is that your rock with a big bullseye in the middle of the chart at scale 450,000?
Forum: Marine Electronics 14-01-2015, 08:49
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

This may be old news to many but you can get paper charts from NOAA in PDF format. Then you can print your own if you have large enough printer.

NOAA Charts PDF Format...
Forum: Marine Electronics 14-01-2015, 05:29
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

Jon,

I fully agree with you. But the VHF display is relying on GPS data to show relative position to the other targets. It's about the same as a chart plotter without the chart. I was comparing a...
Forum: Marine Electronics 14-01-2015, 04:39
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

Mere mortals have a difficult time computing COG without a chart plotter.

It would be good if we state how many years ago it was when the GPS showed us in different places on different days. Since...
Forum: Marine Electronics 13-01-2015, 18:21
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

I have no idea if this particular foundering was due to a chart plotter "getting it wrong". If you know it to be so it would be good to lay out the details. But in the vast majority of real world...
Forum: Marine Electronics 13-01-2015, 11:20
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

A chart plotter is good for lots of things besides knowing position. Computing time to destination, time to course change, speed over ground, course over ground, distance off your planned route and...
Forum: Marine Electronics 13-01-2015, 04:48
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

Doubly so for an inexperienced one...
Forum: Marine Electronics 10-01-2015, 15:24
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

Arguing that ECS is not a fundamental tool of navigation will drive people away from otherwise well intentioned logic. ECS is definitely a fundamental tool and is the primary method of determining...
Forum: Marine Electronics 08-01-2015, 14:06
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

Sometimes it is and sometimes it isn't. There are cases where the chart data has unknown quality. More importantly, much of the future course of the vessel depends on events and data unknowable by...
Forum: Marine Electronics 07-01-2015, 20:32
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

Such a feature is not nearly as simple to implement as it would seem. And it would invite even more reliance on machinery in lieu of seamanship which seems to me the wrong direction we should be...
Forum: Marine Electronics 05-01-2015, 04:09
Replies: 357
Views: 36,647
Posted By transmitterdan
Re: Another foundering how do chart plotters get it wrong

It would just be speculation at this point since we don't know what happened. But chart plotters usually are not sailing the boat (or even steering). I am willing to speculate the satellites were not...
Showing results 1 to 18 of 18

 
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