28
The functions of the VDO Sumlog
The analog indication shows the boat speed, while the display shows
either the total distance or the trip distance travelled, depending on the
selection, when the power is switched on.
The distance is selected by short activation of the pushbutton.
Example:
Indication of the total distance (2312.3 in this example)
or of the trip distance (12.96 in the example)
The units of the indicated speed and distance depend on the selected
calibration factor (see page 29).
The total distance is displayed from 0.0 to 99999.9 and the trip distance
from 0.0 to 999.99, thereafter the counter rolls over to zero again.
The trip distance is reset to zero by keeping the pushbutton pressed for
about 5 seconds when the trip distance is displayed.
Calibration of the VDO Sumlog
After installation of the system your VDO Sumlog must be calibrated to
obtain speed and distance measurements with the maximum accuracy.
Mark two distinct points on the map. The distance between these two
points defines the measuring length (see page 29). During the trip from
one point to the other, the VDO Sumlog measures the covered distance.
In flowing waters it is necessary to make the measuring run in both di-
rections to compensate for the influence of the current.
For indicating units with a simple graduation (12, 30 or 50 without unit in-
dication): Select the desired display unit (knots, mph or km/h) for your
operation prior to the measuring run.
Please note that it is not possible to switch to a different indicating unit
after calibration; this requires a new calibration.
For the indicating unit with twin graduations (50 kn/mph): Select nautical
miles as the unit for the measuring length.
FUNCTIONS / CALIBRATION
23I2.3