yachtmaster

Sorry, I am getting more confused by the minute here.

How can you do a three point fix with visibility down to 10m? I was specifically talking about the blind nav. With blind nav are you totally tied down to depth, bearing, speed and time with, ok, the estimated currents from the chart or can you use radar - or do you do both?

If, whilst blind nav - you only use EP. depth etc then it would be as well to stay out to sea or only enter a harbour where the depth contours cannot be confused ...... seems hairy to me.

I have been caught in fog where I cannot see the bow of the boat - I can imagine getting home OK using radar, depth, EP - no chart plotter but would be worried sick without the radar!

Am I missing something here?
 
Yes - I do it using a large compass it took me years to find.

I take the ranges to three points 120 degree apart if possible and draw nice arcs. Thus utilising the main feature of radar - range. But I can only do this with radar.

So does the blind nav always assume you have radar? That is my question. /forums/images/graemlins/smile.gif
 
Basically if your say three to four miles out and the instructor says take me back to the Marina in 10m visibility you plot aocurse to say the further end of the breakwater, measuring the distance to first the 20m then the 15m then the 10m and then the 5m contour line.

Using DR you liase with the helmsman by having him stick to a constant speed and calling out the depth, (allow for tidal diff as necessary). When you get to the 5m line chances are you should be near your breakwater, have him slow down to say 3knts, until he eyeballs the breakwater.
 
Understand what you mean now.

In that situation in real life though, without radar you cannot see other boats and so would it not be better to avoid going into a funnel where you could easily hit another boat and therfore best to stay out at sea in as safe an area as possible?

I can see the sense in doing it by depth alone as I guess once done a few times, it all adds to the experience. So I am not in any dispute here ...... its just that you originally mentioned buoys and the only way you could see them is by radar - to plot a course near to one when visibility may only be 30 foot is asking for trouble .... agreed?

I would probably rate as a very arkward student but its only because I am interested. /forums/images/graemlins/laugh.gif
 
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I would probably rate as a very arkward student but its only because I am interested. /forums/images/graemlins/laugh.gif

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Yachtmaster certificates were for sale last week on this forum for £100 each, saves all the hassle !

See the For sale forum "RYA Coastal/Yacht master for sale"
 
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therfore best to stay out at sea in as safe an area as possible?

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Except if you have an "issue" on board that means that you'd need to go in. And then you proceed at low speed with ppl listening as hard as possible etc etc.... and your probably safer going shallow where the really big buggers won't be.

At night in the fog - was interesting and very easy to loose your bearings ... luckily it was DS practical so the Chart Nav didn't "fail" ....
 
I've seen it done to Buoys in SHampton water, student works out point to say a port hand buoy, gets close enough for the helmsman to spot it, when the navigator thinks he is near by his reckoning hes says something like, so & so buoy should now be off your port quarter. When confirmed he knows where he is, and proceeds to next point

_________________________________________________________________

"In that situation in real life though, without radar you cannot see other boats and so would it not be better to avoid going into a funnel where you could easily hit another boat".


In the instance I quoted earlier, this is precisely what I did on my blind Nav to avaoid other vessels, though the instructor said "get me back in port", I though it prudent not to head directly for the entrance as indeed you say other boats may be trying for same, so I went to the other end of the breakwater and upon visual slowly worked my way along to the entrance.
 
I am still puzzled by navigating to a buoy with visibility of just 30 foot - if you are accurate you may hit it!!

Certainly with improved visibility buoy hopping is great but not, surely, with no visibility?
 
I am still having a problem with this.

On my boat 30 foot vis means I have no more than 5 to 10 foot in front of the bow.

At 5 knots, I am travelling that 10 foot in about 3 seconds and that mean that i cannot turn to get out of the way of the buoy!!!!! in practice I may only have 5 foot and about 1.5 seconds!!!!

So I do not see how I have the time to avoid the object I am aiming at - even if I react instantly, I would still hit it.

So can someone please explain to me how, without radar travelling at 5 knots you should head for a buoy?????

A totally confused YM theorist waiting to take his practical....
 
Without starting another arguement! Don't you think the RYA syllabus and examiners don't know what they are about. If you plan a route which takes you across commercial routes or likely to put you in path of other boats without taking necessary precautions, you'd fail.
 
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