How often to update charts?

[Dooglas]

Originally Posted by Belezar

Well, I never said I wouldn’t, but in general fixed objects don’t move much.

Actually, aids to navigation such as buoys and panel markers move all the time.

[Belezar]

Thanks for all the replies. I am meaning chart plotter charts, but still it’s good to consider all the options available. I think a great deal depends on where and when you sail. Shoaling isn’t always a concern, but I don’t trust charts to be that exact. I’d rather not cut things too close.

[Hudson Force]

Sand can be in a new place any day; mud can be in a new place by the following day, gravel may take a month; rock remains.

[karle]

Originally Posted by Dockhead

Or if you are in waters where there is free cartography, like the U.S. or Norway, you can download that frequently and study your passages using OpenCPN. The fresh cartography doesn't necessarily need to be on your chart plotter.

Hello, where can one download Free Norwegian cartography for use with opencpn?

[Dockhead]

Originally Posted by karle

Hello, where can one download Free Norwegian cartography for use with opencpn?

I use OSenc:


http://www.o-charts.org/map/en/NO/index.html


They are not free, but almost so (€21).


I heard somewhere you can also get them directly from Kartverket and for free, but I haven't explored that.

[ranger58sb]

We update our U.S. NOAA raster and vector charts once/year. Aquamap and iSailor charts update as they release new ones: Aquamap, often throughout the year; iSailor occasionally.

-Chris

[Tillsbury]

Originally Posted by Hudson Force

Sand can be in a new place any day; mud can be in a new place by the following day, gravel may take a month; rock remains.

Rock doesn't remain... it moves every now and then. Quite a long way sometimes.