Electronic chart scales

[Storyline]

Does anyone know whether C-Map and Navionics have the same scale when zoomed in. I have just ordered a C-Map Western Isles chart for c.£80. This just covers the outer Hebrides and yet I have read you can buy a Navionics chart for the whole of the UK for £200. If I was to do this using my C-Map plotter and charts it would cost a small fortune.

Why the huge difference in price?

 

[pbeard]

Have just been looking at these myself and you can get the Navionics for £164 from certain chandlers inc VAT and del. This is the new XL9 version which covers whole of UK & Ireland, north French coast and up to Denmark. Beware you don't get flogged the older XL3 version which of course they will be still trying to get rid of!

 

[pvb]

Electronic charts...

Electronic charts use many different scales, as they're based on lots of different paper charts. So the scale available to you when you zoom in will depend on which chart they used for the particular bit of sea you're looking at. If it's a relatively unimportant bit of water, the scale might only be 1:500000 but if it's the approach to a harbour the scale might be 1:10000. Most plotters allow you to display the chart boundaries on-screen so you can see when you're moving to different scales.

Both C-Map and Navionics now offer a complete UK cartridge for around £200. But these won't necessarily have the same detail as a Local cartridge when you zoom in (especially in less-frequented places).

 

[jeremyshaw]

You need to be sure you are comparing like with like. If you look at the C-Map web site you can see exactly which charts are embedded in the chip (as previous poster has said, they are digitised from collections of charts). Navionics may do the same and this will give you a decent comparison of what you are actually getting.

 

[Storyline]

[ QUOTE ]
You need to be sure you are comparing like with like. If you look at the C-Map web site you can see exactly which charts are embedded in the chip (as previous poster has said, they are digitised from collections of charts). Navionics may do the same and this will give you a decent comparison of what you are actually getting.

[/ QUOTE ]

That is what I was trying to find out. On the C-map site you can see what you are getting. The Western Isles cartridge has all the UKHO charts. I cannot find the same info on any Navionics site.

Anyone know where to get this info.

 

[duncan]

my experience with these is that the same underlying data is there on all the cartridges - it's simply not in the manufacturese interests to differentiate it.

your plotter unit will zoom down to the highest level of detail if you request it.

you don't get a pontoon on a small navionics chartlet that then disappears on a larger one.

this is not the same question when applied across different charting programs however - different topic.