Originally Posted by Dockhead
Arrrr . . .
But be extremely careful -- many available downloads of CM93 have horrible virus infections in them. Best of all, take a copy from a trusted fellow cruiser.
Note also that the last version of CM93 is missing some of the detail of the next to last (don't ask me which ones these are).
Lastly, keep in mind that these are NOT FOR NAVIGATION
. They are not up to date, not official, not legal
, pirated charts
. I emphasize: they are NOT UP TO DATE. Use them only for basic planning, if you use them at all (many people will say it's not moral -- you have to make up your own mind -- and in any case at your own risk and on your own conscience).
Then, buy up-to-date licensed charts from Jeppesen (the owner of the CM93 sets) for those areas where you will actually be.
Put those in your chart plotter, maybe, and use O on a laptop
for planning and/or nav table use.
It is not responsible to sail without updated, official cartography of some kind. If you run into an obstacle which is shown on updated charts, because it's not shown on whatever chart you have, it is all your fault.
Sorry, I would not have expressed this that way:
1. Once upon a time they have been made vor Navigation
2. Chart offsets google
for, but mostly your eyeball is enough (before dark)
3. The new Jeppensen vor small boats are nothing better than the old and yes I do have them, believe it or not, some CM93 versions are much more usefull than the Plan2Nav now
4. Yes the newer the version the less information, but sometimes the more accurate. But for example, a countainer port since >10 years is in use, but not in the newest chart, at least in the old as reclamation area, what do you think of that, Skipper
goes into prison not using the newest chart, but the chart companies do not care, if they do not and sell wrong charts...
At least Navionics
is closer up, but agaiin, many small bays are just greyed out, in the old CM, misplaced but there, are the depths.
5. Set aside a few earthquakes, how many miles do islands, bays rocks wander every year? And an official chart purchased for the Red Sea dated back when Negrelli had surveyed that area with help of the Austrian Navy
when he started bulding the Suez Canal, after his death the canal was finished by British. Now this is a NEW chart!
I sail with the newest charts from Navionics
installed and Jeppensen Plan2Nav on Tablet for chart checking, but always keep an eye on openCPN
development, did not find more mistakes
in CM93 than in the newer counterparts, but compare and use not only one issue, 2002, 06, 07, 09, 10, 11 i know exist. May 09 might be the best balanced edition, most positions are quite correct, the 06 edition seems to be the most complete one, least grey areas, but easily puts you on a rock, at least you know how deep. And you can easily correct for the offset. I cruise