This link below gives further information. Specifically, it counsels that sharing your location can be a risky thing to do, and gives these tips:
• Only share your location with people you know in person. Never share your location with strangers.
• Don’t add contacts to Snapchat if you don’t know them in person.
• Regularly review your settings and take an active decision about whether you want people to know your location.
Think about who you’re sharing your location with. Location services such as Snap Maps can lead people to your house.
It is advised that SnapChat users change their settings so as to hide their location by default. Pupil users should certainly do this.