Calibrating The Sensors; Fig. 2-18 Dc Power Connections - Raymarine L750 Operating Handbook

Chapter 2: Installation
Shield connected
to RF ground
5A fuse or
circuit
breaker
+
to red wire
12V DC
source

Fig. 2-18 DC Power Connections

Calibrating the Sensors

The transducers most often used with this unit include sensors for boat
speed and water temperature. These sensors are normally very
accurate, but you may want to calibrate them.
The speed indication on your Fishfinder is usually very accurate.
However, there are some special cases where the speed reading may
be high or low. This means that the speed of the water past the
transducer may not be the same speed that your boat moves through
the water. The hull of the boat may have a shape which channels water
past the transducer at a speed which is faster or slower than normal.
1. To calibrate the speed sensor, set up a course between two known
points. As markers you can use buoys, range markers, or
landmarks. Measure the length of time the boat takes to cover a
known distance.
Power
connector
connection
Transducer
connector
To
transducer
Small orange, yellow,
green and blue wires
not connected
-
connection
or ground
to black wire
25