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I can see the sea

 
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dai_uk
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Joined: Apr 19, 2005
Posts: 7

PostPosted: Wed May 04, 2005 9:04 pm    Post subject: I can see the sea Reply with quote

When I first got my new toy I was poking about with it while driving (I know I know) and got the above sea level data come up, never been able to find it again anybody any ideas
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Scruge
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Joined: Apr 25, 2005
Posts: 42
Location: TX

PostPosted: Thu May 05, 2005 2:05 am    Post subject: Reply with quote

What do you mean by sea level data? According to Navman the 510 doesn't provide elevation.
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dai_uk
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PostPosted: Thu May 05, 2005 3:17 pm    Post subject: Reply with quote

Well mine did........once. bottom of screen above the dark blue address bar, the lower L/H side was filled with lighter blue background with height above sea level data in white lettering. But as I say not been able to find it again.
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Scruge
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Location: TX

PostPosted: Thu May 05, 2005 3:31 pm    Post subject: Reply with quote

Perhaps they removed it with one of the updates. The area on the display you refer to is near the GPS single strength indicator, isn't it?
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Scruge
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PostPosted: Sat May 07, 2005 2:46 pm    Post subject: Reply with quote

dai_uk wrote:
Well mine did........once. bottom of screen above the dark blue address bar, the lower L/H side was filled with lighter blue background with height above sea level data in white lettering. But as I say not been able to find it again.


BTW, I noticed if you goto one of the gps status screens (3rd I believe) you'll find the elevation in bottom right hand corner in very tiny print along with other info. Strange being Navman support said the 510 doesn't provide elevation. My firmware version is 3.0027 incase you don't find it on yours.
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sealion
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Joined: Mar 27, 2005
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PostPosted: Sat May 07, 2005 3:47 pm    Post subject: Reply with quote

No, surely that is the elevation of the satellite highlighted. If you change satellite so does the elevation.
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Scruge
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Joined: Apr 25, 2005
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Location: TX

PostPosted: Sat May 07, 2005 5:16 pm    Post subject: Reply with quote

sealion wrote:
No, surely that is the elevation of the satellite highlighted. If you change satellite so does the elevation.


I'm pretty sure its your elevation. Mine is consistant with my hand held gps. I typically see a variation depending on satellites of between 65'-91' and according to data from usgs my actual is 76' above sea level.
My understand is that elevation is a bit more tricky to calculate and requires a minimum of 4 strong satellite signals.

But then again I haven't come across any documentation regarding the info displayed either.
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sealion
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PostPosted: Sun May 08, 2005 3:29 pm    Post subject: Reply with quote

I say again, if you move the highlight from one satellite to the next, so does the elevation. This indicates the angle of elevation above the horizon. It does not give your elevation above sea level.
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Simon1
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Joined: Aug 07, 2004
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Location: Surrey, UK

PostPosted: Sun May 08, 2005 8:20 pm    Post subject: Reply with quote

I can confirm sealion's comment. Definately the satellite's elevation.
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Scruge
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Joined: Apr 25, 2005
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Location: TX

PostPosted: Mon May 09, 2005 3:27 am    Post subject: Reply with quote

sealion wrote:
I say again, if you move the highlight from one satellite to the next, so does the elevation. This indicates the angle of elevation above the horizon. It does not give your elevation above sea level.

yep, looks like you're right... Knew it was to good to be true.

So what purpose is served knowing the azimuth and elevation of a satellite with only two significant digits?
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