Garmin GPSMAP 640 - Manual (Page 67)

GPSMAP 620 and GPSMAP 640 Owner’s Manual 61
Automotive Mode: Using the Map
Trip Computer
The trip computer displays your current speed and provides helpful
statistics about your trip. To view the trip computer, touch the
Speed field on the map.
If you make frequent stops, leave the device turned on so it can
accurately measure elapsed time during the trip.
Resetting the Trip Computer
Reset the trip computer before beginning a trip. From the map,
touch the Speed field. Touch Reset trip to reset the information on
the trip computer. Touch Reset Max to reset the maximum speed.