ios - Filter an NSArray based on distance from certain point and longitude and latitude -

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i have entity objects in it. these objects have longitude , latitude. want following.

i want objects 5000 meters current location. question is, best way off doing , keeping in mind entity can contain 5000 records.

i thinking on making nspredicate , somehow longitude can have deviation of 0.005 or something? don't have idea of or bad ?


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