The TIMEWISE 547B rally odometer is designed for either "Pro-rally" stage events or limited "B-class" TSD road rallying. Dual odometers, time of day clock, and independent timer provide precise time and distance information for the navigator. Non-slip toggle switch actuators give positive operator feedback, and a single rotary switch eliminates an array of closely spaced function select pushbuttons. An optional remote display can show speed or distance information to the driver. All parameters are shown on ultra-bright, 0.6" tall LED displays. The timer and auxiliary odometer can be Taylor split (simultaneously split and internally reset to zero) for incremental measurements. The 547B includes a datalog memory that saves the most recent 250 splits. All parameters, including the odometer factors and personal setups, are automatically saved in non-volatile memory when power is removed from the 547B. An optional battery-backed real time clock is available.