CM93 / UK charts question.

ProDave

ProDave

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this is not about where to get charts, lets assume we have them.

the CM93 set of charts covers the whole world and takes up 1.7Gb of my hard disk space.

It has 921 folders full of charts in it's root directory.

So if I want to copy them to a phone or tablet with limited storage space, does anyone have a list of which folders I need just to get UK charts and which folders I can not bother with?
 
I thought about that for a few minutes about an hour ago and tried to open the files in the root to see if one was a chart list but couldn't see the answer.

In the end I copied the whole lot to my tablet along with OpenCPN Android and it works great!

Richard
 
RichardS said:
I thought about that for a few minutes about an hour ago and tried to open the files in the root to see if one was a chart list but couldn't see the answer.

In the end I copied the whole lot to my tablet along with OpenCPN Android and it works great!

Richard
Click to expand...

May I ask how you did it please? MY Samsung notebook only has a mini USB socket, I have the charts saved on a CD/DVD and on an external hard drive via USB 3 to my laptop. USA charts are easy as I can download them fresh for free which is how I keep them up to date too. Would a USB to mini USB adapter work?, I saw one on Amazon recently I think for very few dollars.
 
Robin said:
May I ask how you did it please? MY Samsung notebook only has a mini USB socket, I have the charts saved on a CD/DVD and on an external hard drive via USB 3 to my laptop. USA charts are easy as I can download them fresh for free which is how I keep them up to date too. Would a USB to mini USB adapter work?, I saw one on Amazon recently I think for very few dollars.
Click to expand...

I have a USB socket to mini USB cable (often called an OTG or On the Go cable) so just copied my CM93 directory to a memory stick and plugged that into the tablet with the OTG. However, if you suitable cable with a mini USB plug on one end an ordinary USB plug on the other you could just connect the tablet/phone directly to the PC and you will see the tablet with a drive letter on the PC like a USB memory stick. You can then just copy the files directly from the PC to the tablet.

Richard
 
RichardS said:
I have a USB socket to mini USB cable (often called an OTG or On the Go cable) so just copied my CM93 directory to a memory stick and plugged that into the tablet with the OTG. However, if you suitable cable with a mini USB plug on one end an ordinary USB plug on the other you could just connect the tablet/phone directly to the PC and you will see the tablet with a drive letter on the PC like a USB memory stick. You can then just copy the files directly from the PC to the tablet.

Richard
Click to expand...

Thank you kind sir! I have a mini-USB cable for charging the phones so I will try using that. later :encouragement:
 
I don't know if this helps:

CMAP/2 regions (They should be the same for CMAP4)


1. Coasts of Western Europe.
2. Mediterranean Sea.
3. Coasts of Western and Southern Africa.
4. Arctic coasts of Europe and Asia, Sea of Okhostsk and Kamchatka.
5. Western Indian Ocean, Suez Channel, Red Sea, Persian Gulf, Arabian Sea,
India and Sri Lanka.
6. Coasts of China, Korea and Japan.
7. Indonesia, Australia, New Guinea, New Zealand and Oceania.
8. Coasts of North and Central America, Gulf of Mexico and Caribbean Sea.
9. South American coast.

Please note that this is for cmap/2 only. Cmap's new file format, cmap/3 is totally different.

How to figure out what a directory or file represents?
Notice that the primary folders are numerical like this 03900900.
To understand what content is in the folder we must break it down into two sections.


The first 3 numbers represent Latitude:


003=80S-60S 009=60S-40S 015=40S-20S 021=20S-Equator 027=Equator-20N
033=20N-40N 039=40N-60N 045=60N-80N


The last four digits represent longitude. Read from left to right.


0000=0E 0060=20E 0120=40E 0180=60E 0240=80E
0300=100E 0360=120E 0420=140E 0480=160E 0540=180E or W
0600=160W 0660=140W 0720=120W 0780=100W 0840=80W
0900=60W 0960=40W 1020=20W


Within each of the primary folders are other folders represented by a letter.
Here's what they contain


A, World scale ranging from 1: 3,500,000 to 1: 1,500,000
B, General nautical scale ranging from 1: 1,500,000 to 1: 500,000
C, Coastal scale ranging from 1: 500,000 to 1: 150,000
D, Intermediate coastal / approach scale ranging from 1: 150,000 to 1: 50,000
E, Approach scale ranging from 1: 50,000 to 1: 15,000
F, Harbour scale ranging from 1: 15,000 to 1: 5,000
G, Plan scale, larger than 1: 5,000
 
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