Electrical tracking apparatus; Radio signalling instruments for use in tracking; Vehicle tracking apparatus; Global positioning system (GPS) apparatus; Target trackers (satellite); Trackers (computer apparatus); Wearable activity trackers; Nautical apparatus and instruments; Nautical instruments for use in the navigation of sailing craft; Life saving apparatus and equipment; Life saving instruments; Alarm signalling apparatus; Alarm signalling receivers; Alarm signalling transmitters; Apparatus for signalling; Apparatus for signalling aircraft; Apparatus for signalling ships; Apparatus for signalling vehicles; Electric signalling apparatus; Electrical apparatus for the signalling of personnel; Electrical instruments for signalling purposes; Electrical signalling apparatus; Electrical signalling instruments; Instruments for signalling; Light signalling apparatus for use by persons in emergencies; Microprocessor driven control units for automatic signalling systems; Rotary movement signalling apparatus; Signalling apparatus; Signalling apparatus and instruments; Signalling apparatus for use in emergencies; Signalling equipment; Signalling instruments; Training aids for animals (signalling whistles and clickers); Apparatus for checking the contents of luggage; Speed checking apparatus; Speed checking apparatus for land vehicles; Speed checking apparatus for vehicles