Updating charts

[KRG]

I understand what you are saying for the main charts but if the folio chart is just an extract from a current chart it would be an unnecessary replacement. The folios contain about 18 chart extracts, now, if say a main chart had become obsolete and that only effected say, two chart extracts, providing one knows which one and why it would still be ok to correct and use the others, wouldn't it?

 

[Superstrath]

[ QUOTE ]
When you make the correction, you should put the date in the margin of the chart update. Then when you look down the list of corrections from HMHO you can see if you have the latest updates.

You only really need buy a new chart when it gets to tatty or the updates are filling up the blue bits!

[/ QUOTE ]

No. If there is a major survey, or a big change, say a new harbour or a big bridge, they will put it on a New Edition. There will not be a correction issued detailing the big change.

If it was as easy as keeping up with corrections, then MN and RN ships would buy charts once, on commisioning, and never replace them. In fact all relevant New Editions are purchased, because the old chart is obsolete, and can no longer be corrected.

Alistair

 

[bumblefish]

I'll have a look and see if I have the chart and corrections, I seem to have a large selection!

 

[Sans Bateau]

Ok! I wouldnt argue that one! A new harbour or bridge IS a major change, that would need a new chart. But surely nav mark changes, confirmed depths etc that we most often see dont warrant a new chart? In which case my original statement is correct, isnt it?

 

[KRG]

Yes, i've extended loads of little depth contours around the Isle of Wight and wondered what am I doing this for but sadly, I still do them so I can tick them off the list /forums/images/graemlins/grin.gif

 

[Superstrath]

[ QUOTE ]
I understand what you are saying for the main charts but if the folio chart is just an extract from a current chart it would be an unnecessary replacement. The folios contain about 18 chart extracts, now, if say a main chart had become obsolete and that only effected say, two chart extracts, providing one knows which one and why it would still be ok to correct and use the others, wouldn't it?

[/ QUOTE ]

SC5600 contains information from a lot more than just 3418 Chichester and Langstone. Just because 3418 hasn't been replaced does not mean that something else on SC3600 has been changed enough to justify a NE. The problem for us is, that without inspecting every part of the old and new editions, we don't know what the differences are. They could be many and varied.

 

[Superstrath]

[ QUOTE ]
But surely nav mark changes, confirmed depths etc that we most often see dont warrant a new chart? In which case my original statement is correct, isnt it?

[/ QUOTE ]

I agree that in many cases the changes in a NE may be of little interst to us. But the changes in a new edition from the old have not all necessarily been promulgated in corrections. So a change to a light or mark that is of interest to us might go out on the new edition, and we would not change it on the old chart, because there was no correction.
I'm sure raking about the Admiralty website would come up with a statement similar to that on the Imray site. The Imray statement is unequivocal.

Alistair

 

[KRG]

[ QUOTE ]
SC5600 contains information from a lot more than just 3418 Chichester and Langstone. Just because 3418 hasn't been replaced does not mean that something else on SC3600 has been changed enough to justify a NE. The problem for us is, that without inspecting every part of the old and new editions, we don't know what the differences are. They could be many and varied.

[/ QUOTE ]

Yes I agree but this can be determined by checking for new issues of the main chart. The originating chart is referenced on the extract. It is then easy to check to see if the main chart has in fact been updated after the issue of the folio or not.

 

[Malish]

Rotring no longer offer purple ink, you can source a purple ink from craft shops. The bottle will claim that the ink is permanent but their definition is often different to mine as these inks will be at least partly washed off by rainwater. I source a couple of bottles of Rotring's best from a decent art supplier who had them in store pending disposal, much more water resistant than the craft shop variety.