Probably the most common way to "hide" a coordinate is to obfuscate it. You can easily do this by randomizing the last couple digits of the coordinates. How much obfuscation is required is up to you. This would effectively eliminate the security concern but it also may lead to problems in the application. One way around this is to use an icon that doesn't have a point on the end of it, like a circle instead of a standard market. That way, the circle should effectively cover where the user is likely to be but won't pinpoint their exact location.
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