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GPS question

1756 Views 17 Replies 6 Participants Last post by  Team Bloody Waters
This may be a stupid question but I've had some charts that use different datums but are most numbers in WGS 84? More specificly the new nearshore reefs that were set last july?

thanks for the help in advance.:letsdrink
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WGS 84 is the standard spheroid for us navigational charts and navigational instruments. However, a user can select a different spheroid for most GPS units. Using a different spheroid can result in significant (miles) of error, depending on the location. If a person publishes numbers or a company publishes a chart in other than WGS 84, they should note that (since it is non-standard in the US)

Probably more info than you need, but a spheroid is the grid a particular system lays over the earth. Different spheroids have different starting points and orientations, so they don't match up, so you get errors if you use one when you should be using another.
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