Clarion NZ501E User Manual page 79

This is not a button. This line shows the current size of the trip
database, the sum of all trip and track logs saved.
Track logs, the sequence of the positions given by the GPS receiver,
can be saved together with trip logs. They can later be displayed on
the map. You can let the application save the track log whenever it
saves a trip.
NX501E/NZ501E English 79