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Thread: The danger of GPS as the sole means of navigation. Reply to Thread
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  Topic Review (Newest First)
3 Hours Ago 12:28 PM
MedSailor
Re: The danger of GPS as the sole means of navigation.

Quote:
Originally Posted by jackdale View Post
The three fundamental rules of navigation:

1) Sail on the white stuff
2) Anchor on the blue stuff
3) Drink on All of the above
There, fixed it for ya'!
18 Hours Ago 09:47 PM
jackdale
Re: The danger of GPS as the sole means of navigation.

Quote:
Originally Posted by hellosailor View Post
You guys have got this all wrong. Wrong wrong wrong. Stop arguing about where the blue stuff and the brown stuff really are, just get a hovercraft or a DUKW and don't worry about whether about what's under it.

Damned keelboats, that's the problem here. The navigation issues are all caused by that.
The three fundamental rules of navigation:

1) Sail on the white stuff
2) Anchor on the blue stuff
3) Drink on the brown stuff
19 Hours Ago 09:13 PM
hellosailor
Re: The danger of GPS as the sole means of navigation.

You guys have got this all wrong. Wrong wrong wrong. Stop arguing about where the blue stuff and the brown stuff really are, just get a hovercraft or a DUKW and don't worry about whether about what's under it.

Damned keelboats, that's the problem here. The navigation issues are all caused by that.
1 Day Ago 02:09 PM
colemj
Re: The danger of GPS as the sole means of navigation.

What do you do if your charts are wrong? You will be in trouble also. This was the whole point here.

Of course you are better off looking at the land in front of you - that is the whole point I and others have been making.

Electronic charts are not evil and they don't force people to be bad navigators. MarkJ has presented quite the opposite view, and I agree with him.

Even the argument that they facilitate people getting into trouble is non-sensical. If you want to argue that slippery slope, you will debate yourself right out of recreational boating entirely.

Mark
1 Day Ago 01:22 PM
jackdale
Re: The danger of GPS as the sole means of navigation.

Quote:
Originally Posted by Stu Jackson View Post
Good points. One of the techniques I've used for clearing / danger bearings is to plot waypoints that clear these.
My clearing bearings are on a chart. Or in this case on my raster charts in OpenCPN.

1 Day Ago 01:19 PM
hellosailor
Re: The danger of GPS as the sole means of navigation.

"Giving someone coordinates like "230 bearing from the last palm on the left, "
Only works until there has been a storm and the last three trees "on the left" are no longer there, so you wind up with some slightly wrong information.

If it can be moved--sooner or later it will be.
1 Day Ago 01:04 PM
Stu Jackson
Re: The danger of GPS as the sole means of navigation.

Quote:
Originally Posted by jackdale View Post
snip

I would also suggest you would be better off looking up at the land in front you, than staring a chartplotter.

In coastal waters I would rather use a paper chart with unmarked hazards highlighted and clearing / danger bearings on the chart.
Good points. One of the techniques I've used for clearing / danger bearings is to plot waypoints that clear these.
1 Day Ago 12:52 PM
jackdale
Re: The danger of GPS as the sole means of navigation.

Quote:
Originally Posted by colemj View Post
The geographical position as it relates to the paper chart. Relative position taken off an inaccurate chart is meaningless. Giving someone coordinates like "230 bearing from the last palm on the left, and 48 bearing from the pink house" isn't very specific or portable, although no doubt they are keeping you from hitting land.

So would not driving your boat onto the beach.

Mark
Geographical position is lat and long.

A relative position would show you where you are in relation to land and hazards.

I would also suggest you would be better off looking up at the land in front you, than staring a chartplotter.

In coastal waters I would rather use a paper chart with unmarked hazards highlighted and clearing / danger bearings on the chart.
1 Day Ago 12:27 PM
colemj
Re: The danger of GPS as the sole means of navigation.

The geographical position as it relates to the paper chart. Relative position taken off an inaccurate chart is meaningless. Giving someone coordinates like "230 bearing from the last palm on the left, and 48 bearing from the pink house" isn't very specific or portable, although no doubt they are keeping you from hitting land.

So would not driving your boat onto the beach.

Mark
1 Day Ago 12:16 PM
jackdale
Re: The danger of GPS as the sole means of navigation.

Quote:
Originally Posted by colemj View Post
And your actual position on the paper chart would still have you on land.

You would also get a different result if you simply stopped driving your boat forward before it hit the shore.

No compass, rulers, etc required.

Mark
What do you mean by "actual position"? One determined by GPS (geographical position) of one determine by a two or three bearing fix (relative position)?
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