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Messages - poutnikl

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496
Troubles & Questions / Re: Different altitude values
« on: October 27, 2015, 16:02:36 »
There are up to 3 sources of data. SRTM radar data, GPS data and altimeter data.

During planning,  heights are used from Locus elevation SRTM DB ( Space-shuttle Radar Topography Mission )

During track recording, they are taken either from current GPS data, either from pressure altimeter.

Altitude correction is the correction of WGS84 Earth geoid model to real Earth. For the middle Europe, the raw GPS height is about 60 metres higher than real one.

Optimize GPS altitude explicitly states it uses offline elevation data, i.e. SRTM radar dat. As altimeter is much more precise than GPS, especially for relative and short term values, you should consider to turn it OFF.

497
Troubles & Questions / Re: Rotate map
« on: October 26, 2015, 19:51:31 »
Does the filter apply to orientation generally,  or just to the compass?

Sent from Sony Xperia M Dual


498
Navigation & Guidance / Re: Offline navigation - BRouter v1.2+
« on: October 19, 2015, 17:51:07 »
Thanks for my profiles finding their customers...   :)

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