| CPC G08B 21/0225 (2013.01) | 10 Claims |

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1. A user device, comprising a first processor, the first processor being configured to:
acquire a current position of a user;
determine whether the user is deviating from a set route based on the current position of the user;
upon determination that the user is deviating from the set route:
determine a value of a criterion based on an age of the user;
send a request for a risk ranking of the current position of the user to a server;
receive the risk ranking of the current position of the user from the server;
determine whether the risk ranking of the current position of the user is greater than or equal to the value of the criterion; and
upon determination that the risk ranking of the current position of the user is greater than or equal to the value of the criterion:
notify the user to return to the set route; and
notify a supervisor of the user that the user has deviated from the set route.
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