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Old 03-04-2011, 02:53   #1
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UGrib v Poseidon System

Which one's the most accurate for the Cyclades ?

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Old 03-04-2011, 04:39   #2
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Re: UGrib v Poseidon System

They are different ;-)

In 2004 I found Poseidon a very good tool. But, it is a website, which means you need full web access to view it.
Being local from the Greek, I'd think it is very accurate. As far as I recall it also gives wave data, which is helpful when cruising with a smaller boat.

UGrib in turn is a program you install on a PC and use it to watch GRIB Data you downloaded in form of very small files from the web.

I tested several GRIB file viewers, my preferred free one is:


Grib files come from several locations, a good one is:

FREE GRIB Files | Marine Weather Charts | Global Marine Networks

Where you can send a very short coded email to and receive the required GRIB automatically back.
Remember, you do not need to buy a program to use these files. Zygrib handels them well.
If I where you, I'd use Poseidon if I am in an Internet cafe or have full web access, or if I require more info than from the GRIB.
When on board I'd use Zygrib.

Happy cruising,


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Old 03-04-2011, 06:07   #3
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Re: UGrib v Poseidon System

Greetings and welcome aboard the CF, Brettsan.
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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Old 03-04-2011, 12:17   #4
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Re: UGrib v Poseidon System

Hi !
I agree with Franziska for the essential... But, with a preference for Poseidon that is, to my opinion, more precise concerning the local phenomenas, for example, the straits between 2 islands or the effect of the altitude of the islands on the wind on the opposite side....
In fact, if you have a 3 G USB connection (Vodaphone or Wind : prepaid system) you will have internet connections quite everywhere in the Aegean and so Poseidon or Passagewhether or the official Greek meteo ...
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