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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 06-23-2007
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GPS is accurate....
The government run GPS system is NOT always accurate. It can be, and has been in the past, purposefully OFFSET. This occurs particularly near military installations and near military operations and exercises. Not to long ago the Notice to Mariners had a notice regarding "military testing" occurring near us that would offset GPS in our area by as much as 3NM.
And yes, chartplotters graphic representation of what is actually on the ground may also be inaccurate.
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Old 06-23-2007
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I think what Cam is trying to say is that the GPS just reports your position to the chartplotter and your chartplotter displays a little boat (or other mark) where it thinks that position is on a map. Also, I was not overzoomed. It showed us in this position regardless of the zoom level. The canal was only 100'-150' wide here, but with WAAS and even standard GPS signals, I should be within 50' of my actual position. In this case, I was mid-channel, but it shows me a good 150'-200' on land. I'm pretty sure it's inacurrate cartography.

Now back to the original thread - anyone else have funny stories? If you notice, not only am I on land, but I'm also on Mars! (the "h" is covered - it's supposed to say Marsh).
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Old 06-23-2007
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