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Old 23 May 2002, 06:47   #11
Country: Denmark
Town: Copenhagen
Boat name: Nemesis
Make: CAPE 79
Length: 8m +
Engine: Suzuki 250 4 stroke
Join Date: Dec 2001
Posts: 252
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Map coordinates

Matiboy, I going to PM you about this

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Old 23 May 2002, 10:00   #12
Country: UK - Wales
Town: Cardiff
Make: Humber Destroyer 5.5
Length: 5m +
Engine: 90hp OB
Join Date: Apr 2002
Posts: 483
To answer your query re "Datum".

A map datum is a reference model of the earth's shape.
Every map uses a map datum. If you are comparing GPS coordinates to a paper map or other source the map datum in the GPS must match the datum of the source.

I don't think the astro site will say what datum it uses so you cannot be sure that the datum they have used matches the one entered on your GPS. I am also not sure whether autoroute states what datum it uses may be someone else can confirm.

In my experience the most used datum is WGS84 but that may not be true.

NB what GPS are you using ? If it is a Garmin and you have a pc link I can send you a route of the whole journey to upload. I use a psion 5mx and Route planner Europe link to an etrex.


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Old 23 May 2002, 13:01   #13
Country: UK - England
Town: Salisbury
Length: 5m +
Join Date: Dec 2001
Posts: 459
magellan 200xl

its an older handheld so have no clever computer links

however info on astro site was accurate for some of uk towns I tried

must admit this datum thing is confusing, why we cant all in the world agree on one thing ?
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Old 24 May 2002, 01:46   #14
Country: Sweden
Town: Aplared
Make: Zodiac MkIII
Length: 4,70
Engine: Johnson 40hp
Join Date: Sep 2001
Posts: 3
I must smile!

Hi All!

"must admit this datum thing is confusing, why we cant all in the world agree on one thing ?"

I can not restrain a smile and a comment (no offence!) to read the above comment from an Englishman.

What about inches, feet, miles in a world of metrics!
What about you english talking about boatspeed in mph.
Mph and kmh is a measure of speed on land in most of the world. Knots is a speed measure on water.

As a Swede it is a bit complicated to read english articles. One article uses miles per hour. The next article uses knots. Same goes for distance. Miles or nautical miles? You have got to be on your toes to get it right in the end.

I dare to say that all newly produced softwaremaps have the WGS84 Datum.

I agree with Matiboy. Why can't we stick to Nautical measurements!!!

Regard to you all. Hope I havn't offended anyone.

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Old 24 May 2002, 04:33   #15
Country: Other
Make: FB 55
Length: 10m +
Join Date: May 2001
Posts: 1,711
ABBA rocks!!

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