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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
In mathematics and in PHP 1e1(from your sample tests) is numeric and is between -180 and 180 (around 2.7), I think you should precise that it isn't a correct value for coordinates.
Plus there isn't any part in your instructions saying that $coordinates isn't a single coordinates but a full array of them, it's quite bothering to notice that when you finish coding.