A personal device worn by an athlete during a timed event, the device comprising: an attachment member to be worn by the athlete; a transceiver coupled to the attachment member, the transceiver to receive signals during the timed event, wherein the signals cause the personal device to automatically determine and record one or more measured split times for the athlete during the timed event; a display coupled to the attachment member to display data associated with the timed event including a comparison between a measured split time for the athlete during the timed event and a predetermined split time of a plurality of predetermined split times for the athlete during the timed event; at least one processor; and a memory operatively coupled to the at least one processor and storing computer readable instructions that, when executed, cause the personal device to: receive, from another physically separate device, a user-specified plan for the timed event defining the plurality of predetermined split times, wherein the user-specified plan is previously stored in the other physically separate device; and transmit, through the transceiver during an athlete registration process for the timed event, personal information specific to the athlete stored in the memory, the athlete registration process occurring prior to the start of the timed event; wherein the personal device stores the plurality of predetermined split times. an attachment member to be worn by the athlete; a transceiver coupled to the attachment member, the transceiver to receive signals during the timed event, wherein the signals cause the personal device to automatically determine and record one or more measured split times for the athlete during the timed event; a display coupled to the attachment member to display data associated with the timed event including a comparison between a measured split time for the athlete during the timed event and a predetermined split time of a plurality of predetermined split times for the athlete during the timed event; at least one processor; and a memory operatively coupled to the at least one processor and storing computer readable instructions that, when executed, cause the personal device to: receive, from another physically separate device, a user-specified plan for the timed event defining the plurality of predetermined split times, wherein the user-specified plan is previously stored in the other physically separate device; and transmit, through the transceiver during an athlete registration process for the timed event, personal information specific to the athlete stored in the memory, the athlete registration process occurring prior to the start of the timed event; receive, from another physically separate device, a user-specified plan for the timed event defining the plurality of predetermined split times, wherein the user-specified plan is previously stored in the other physically separate device; and transmit, through the transceiver during an athlete registration process for the timed event, personal information specific to the athlete stored in the memory, the athlete registration process occurring prior to the start of the timed event; wherein the personal device stores the plurality of predetermined split times.