A method includes determining that a portable apparatus is in an exercise mode; obtaining, by the portable apparatus when in the exercise mode, real-time exercise data of a user of the portable apparatus acquired using a sensor set having one or more sensors, and reference data related to the exercise mode; observing, when in the exercise mode, the real-time exercise data, and detecting, during the observing based on comparison of the real-time exercise data with the reference data, that at least one value of the exercise data is uncharacteristic to the exercise mode; and determining, when in the exercise mode, whether the detection of the at least one uncharacteristic value is related to an unpredicted incident, and as a response to the determining that the detection of the at least one uncharacteristic value is related to the unpredicted incident, causing an output of an emergency signal.