[Using phone apps to locate private caches]

Hello,

 

I am running a geocaching class at school and want to 'hide' some caches on the school grounds that only my students can locate (what I call 'private' or non-public caches). I have figured out how to get the coordinates of the hidden caches, but what I want to be able to do is then get students to upload coordinates to their phones and use their apps to locate the hidden caches. Can anybody point me to a place where I can find out how to do this using the different phone apps?

 

Thanks,

 

James