Recently I try to make a map to be displayed in mobile web. My first question is what coordinate system I can use? Any options? Can I use UTM system or I have to use web mercator?What if I don't include base layers like Bing, OSM? Thank you.
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If you're not integrating with OSM/Google/Bing layers then you can use whatever coordinate system you want really.
Otherwise you have you use web mercator if you want the OSM/Google/Bing layer to line up with your map