GPS and chart datums

[deepbreath]

Hi all wonder if anybody has any comments on the following, as I understand it, if I am using british charts for british waters I should use OSGB as my datum in the GPS as opposed to WGS84 or other, what do you think.
Regards nick in cheshire. n/a

[Adrian Kelland]

Hi all wonder if anybody has any comments on the following, as I understand it, if I am using british charts for british waters I should use OSGB as my datum in the GPS as opposed to WGS84 or other, what do you think.
Regards nick in cheshire. n/a

Nick

Read your charts very carefully. IIRC (I have no current charts to hand) there should be a paragraph regarding satellite derived positions. Older charts will have a correction to be applied. More recent versions tend to require no correction. I would use WGS84 and modern charts. I think this is the setting that most users will be using. I also think that this will be the datum that most positions are published with.

Adrian

[deepbreath]

:=Hi all wonder if anybody has any comments on the following, as I understand it, if I am using british charts for british waters I should use OSGB as my datum in the GPS as opposed to WGS84 or other, what do you think.
:=Regards nick in cheshire. n/a

Nick

Read your charts very carefully. IIRC (I have no current charts to hand) there should be a paragraph regarding satellite derived positions. Older charts will have a correction to be applied. More recent versions tend to require no correction. I would use WGS84 and modern charts. I think this is the setting that most users will be using. I also think that this will be the datum that most positions are published with.

Adrian



Thanks for your comments adrian, just a pity the magazines dont say if they are OSGB or WGS84, when they give dive locations.


Regards nick in cheshire.

[Adrian Kelland]

Thanks for your comments adrian, just a pity the magazines dont say if they are OSGB or WGS84, when they give dive locations.

It's probably something the reporters are ignorant of. They certainly make it look that way.

Adrian

[gary pittaway]

In addition to diving I enjoy sailing (particularly old boats - I wont make any reference to the similarity to old women in case of offence) but anyhow, I tried to fully understand WGS84 years ago. I was a techno phobe so all I needed to know was that WGS84 (World Geodetic System 1984)is the format to use. It was set up by the United States Defence Mapping Agency, and it enables receivers to receive and store coordinates from GPS.

Your receiver (base or handheld) should default to this system when you switch it on. Regards, Gary P

[Bren Tierney]

Check out the second of the two URL links below for a VERY comprehensive explanation of GPS, WGS84 and OGB.

A very big thanks here to wreck author ans seasoned diver, Ron Young, and Lt. Commander Nelson McEachan, RN, the Wreck's Officer at the Hydrographic Dept.

Hope it helps.

Bren.

<a href="http://www.yorkshire-divers.co.uk" >http://www.yorkshire-divers.co.uk</a>

[deepbreath]

Check out the second of the two URL links below for a VERY comprehensive explanation of GPS, WGS84 and OGB.

A very big thanks here to wreck author ans seasoned diver, Ron Young, and Lt. Commander Nelson McEachan, RN, the Wreck's Officer at the Hydrographic Dept.

Hope it helps.

Bren.

http://www.yorkshire-divers.co.uk



Thanks bren had a look good stuff.

Nick.