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[mkgmap-dev] Precision circle

From Nop ekkehart at gmx.de on Mon May 25 19:52:26 BST 2009


Marco Certelli schrieb:
> Just a little bit of info. I made some experiments with a GPS72 with other maps (POI only, not OSM) a couple of years ago. I remember the radius of the circle precision is something like "GPS real-time in-accuracy" + "displayed level map in-accuracy". The map in-accuracy depends on the "garmin" level. If a map shows a level 24 (the most possible "accurate" level), the map precision is 3/4 meters. If the map has only levels up to 23, the precision is 6/8 meters. If the map has a maximum level of 22, precision is 10/15 meters, and so on.
> Ciao, Marco.
> P.S. Level 24 means using 24 bits to store coordinates (lat/lon). And so on...

Thank you for the hints. My map contains Objects down to Level 24. I am 
usually at a zoom of 200m or 120m. Maybe it has something to do with the 
level distribution - but I did not change that recently.


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