lustyd
Well-known member
Hi all I just got a gnomonic chart for xmas and it came folded in half and rolled up. Any thoughts on the best way to fold this for storing in the chart table?
Folding a chart
- Thread starter lustyd
- Start date
sarabande
Well-known member
Zoidberg has a patent RAF system which looks like origami but works.
Stemar
Well-known member
I can't remember how it's done, but I had a method of folding Ordnance survey maps so you had, IIRC, 1/4 of the map on your lap and when you came to an edge, that edge folded over to reveal then next bit or you fell off the edge. Likely to be the same system as Mr Z's, but it did involve cutting the map
Gary Fox
N/A
If it's folded in half, put it in. If it won't fit, fold it in half again. Minimum creases, minimum faff. What's it of, out of interest?
lustyd
Well-known member
It's just the Atlantic one. I asked for it as I'd never seen a Gnomonic chart and it interests me, and they are surprisingly cheap for something that's printed to order. I'm thinking of folding the halves in half to the middle and then folding the remaining oblong in half vertically. Annoyingly I can't remember how my other Admiralty charts were folded and all I have in the house are training charts which seem to be folded to fit into the RYA book! This one in half is a bit larger than the chart folios so I know it won't fit well as is and I think I'd prefer it to roughly match the individual folded charts rather than be twice their size as I'm a bit OCD 
lustyd
Well-known member
I am getting curious though how others store charts on board. my chart table is effectively full with the south coast and CI chart folios and I don't feel like I have a good locker to put more in!
prv
Well-known member
I mostly use folios, which fit nicely in the chart table as-is. The few full-size charts I have, I store folded as they came, but refold to show the area of interest when using them. My chart table is deep enough to store all of the Channel coasts without feeling full, but in a previous boat without a space under the table I stored charts in plastic wallets under the quarter berth mattress.
Pete
Pete
PhillM
Well-known member
Mine all live under my mattress. It adds a depth of comfort.
lustyd
Well-known member
yes I was thinking under a mattress but was hoping for some of the usualy forum magic to tell me somthing clever I hadn't imagined
johnalison
Well-known member
My chart table takes Admiralty charts folded once, which is how I transport them. If you are going to use parallel rules, the fewer folds the better. I sometimes fold each half again, leaving three parallel folds, so that the centre section of the chart can be displayed at half size, but that is as much as I will do.
Rappey
Well-known member
Frank Holden
Well-known member
I have a 'half an Admiralty Chart' sized chart table..... I just fold them 'inside out'....
That way there they come out of the drawer/chart locker/call it what you will ready to use.... easy to find the one you want.... no continuous folding/unfolding...
That way there they come out of the drawer/chart locker/call it what you will ready to use.... easy to find the one you want.... no continuous folding/unfolding...
lustyd
Well-known member
Brilliant thanks! That’s not far off the 4+1 I’m considering due to the fold that’s already there
AntarcticPilot
Well-known member
Most maps are designed to be folded in a specific pattern; the position and size of the title block indicates how. If designed for folding, they are folded by machine at the printers, to ensure precise, sharp folds. However, charts are designed not to be folded at all - the ideal storage is flat, or at most folded in half. Folding reduces the geometric accuracy of the map, which is undesirable for a chart. Further, the chart will wear rapidly at the folds, reducing its life.
It is also essential that the latitude and longitude scale printed at the margins of a map be accessible for navigational use - that implies that a chart can at most he folded in 4.
Rolling is undesirable because it imparts a permanent curl that must be removed - it's ok for mailing, but the chart should be flattened prior to use - traditionally by putting it under a mattress!
It is also essential that the latitude and longitude scale printed at the margins of a map be accessible for navigational use - that implies that a chart can at most he folded in 4.
Rolling is undesirable because it imparts a permanent curl that must be removed - it's ok for mailing, but the chart should be flattened prior to use - traditionally by putting it under a mattress!
Rappey
Well-known member
Ive looked back through my old ordnance survey maps and charts.
They are all folded in a similar way regardless of age but the amount of folds are dictated by its folded size.
The smaller ones have up to 4 folds from top to bottom and the bottom fold/leaf even being a 1/4 size of the others .
They are all folded in a similar way regardless of age but the amount of folds are dictated by its folded size.
The smaller ones have up to 4 folds from top to bottom and the bottom fold/leaf even being a 1/4 size of the others .
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AntarcticPilot
Well-known member
There are two possible patterns for folding; I forget their "official" names, but one is side-to-side and then top to bottom, the other is top to bottom then side-to-side. Basically, the choice depends on how you want "folds" of the map to be visible.
We did one do a map that was "flower folded" - if was pasted into a card like a greeting card and opened out as you unfolded the card. But it isn't a practical fold for a map that is to be used - they were really intended as souvenirs rather than serious maps!
prv
Well-known member
AntarcticPilot
Well-known member
Sorry - I should have said, MOST charts aren't designed to be folded. I was thinking of the products of hydrographic offices. As I have a couple of folded Imray charts near me at the moment, I should have remembered that. I have a tendency to forget secondary products!
lustyd
Well-known member
It was a good point that I hadn't considered. This one is a Gnomonic planning chart so not a huge issue and it definitely won't fit without folding at least a little bit