GPS Below Sea Level

Submitted: Sunday, Jan 06, 2008 at 20:43
ThreadID: 53184 Views:2129 Replies:6 FollowUps:3
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I'm looking for a bit of direction here, before I go any further Happy and a Safe New Year to all, now continuing, was driving around today on the coast and went into a new estate to look at all the new houses etc. and noticed a big blue ring around the pointer of my Garmin Quest GPS. Now I thought that was pretty strange because I only see it when it starts up and when its looking for Satellites, when I came back out of the estate it disappeared, I then thought maybe I was below Sea Level.
Any other ideas?

Thanks and Regards

Franga
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Reply By: Member - Doug T (FNQ) - Sunday, Jan 06, 2008 at 20:56

Sunday, Jan 06, 2008 at 20:56
You had it zoomed in too far , under 300m at 30m it is about the size of the screen, nothing to do with sea level, nothing to worry about.

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Reply By: Member - Doug T (FNQ) - Sunday, Jan 06, 2008 at 21:00

Sunday, Jan 06, 2008 at 21:00
I might add if you have it set on Auto zoom and you were going to a point you put ..ie a waypoint it will keep zooming down to that level automaticly the closer you get to the point.

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Reply By: Member - Kiwi Kia - Sunday, Jan 06, 2008 at 21:38

Sunday, Jan 06, 2008 at 21:38
You can have your gps report that you are below sea level. The earth is not exactly round and sea level is not level ! The distance between the satellites and you can be more then the average distance between the satellite and sea level ...clear as mud :-)) This is also why your gps can never be 100% accurate.
AnswerID: 280155

Reply By: Bonz (Vic) - Sunday, Jan 06, 2008 at 21:54

Sunday, Jan 06, 2008 at 21:54
The blue ring is likely to the the accuracy ring, i.e. 30 m ring around you meaning 30m accuracy. usw

The vertical accuracy on normal GPS's is likely to be anything upo to twice what the horizontal accuracy is.

Also, the GPS uses an approximated "sea level", or a standard circle about the centre of the earth. So you may show well below sea level in some places. Thats of course unless you have the barometric sensors etc in the GPS
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Reply By: Rick (S.A.) - Sunday, Jan 06, 2008 at 22:13

Sunday, Jan 06, 2008 at 22:13
Try this for below sea level: it's a genuine photo, taken in my vehicle.


AnswerID: 280176

Follow Up By: Squizzy - Monday, Jan 07, 2008 at 07:03

Monday, Jan 07, 2008 at 07:03
Rick,

I think you would haave been at Lake Eyre to get that reading, I have had the same when out there.

Geoff.
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Follow Up By: Member - Andrew (QLD) - Monday, Jan 07, 2008 at 07:52

Monday, Jan 07, 2008 at 07:52
At the rest area of Lake Eyre (South) i would say....


Andrew
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Follow Up By: Rick (S.A.) - Monday, Jan 07, 2008 at 09:06

Monday, Jan 07, 2008 at 09:06
Right on , Brudda! - only thing is that it was taken before all that signage & parking bay crap etc were erected
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Reply By: Gerhardp1 - Monday, Jan 07, 2008 at 10:45

Monday, Jan 07, 2008 at 10:45
Warning - do not buy a coastal property that is below sea level :)

AnswerID: 280238

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