Sonar Transducer Calibration - Raymarine LIGHTHOUSE SPORT 3.18 Operation Instructions Manual

Sonar transducer calibration

Sonar transducers should be calibrated to ensure accurate readings are
displayed on the MFD.
Depth offset
Depths are measured from the transducer face to the bottom (e.g.: seabed).
An offset value can be applied to the depth data so that the displayed depth
reading represents the depth reading taken from either the keel (negative
offset) or the waterline (positive offset).
Before setting a waterline or keel offset, establish the vertical distance
between the transducer and waterline or the bottom of your vessel's keel, as
appropriate. Then set this distance as the depth offset value.
1. [Below waterline] — The depth reading will be increased from the
transducer's default reading.
2. [Below transducer] — This is the default reading from the transducer
(zero offset applied).
3. [Below keel] — The depth reading will be decreased from the transducer's
default reading.
Configuring transducer settings
For systems with a transducer connected, as part of setting up your system
for the first time it is important that you correctly configure your transducer.
Transducer configuration settings are available from the Fishfinder app.
Set up
1. Select [Transducer] from the Fishfinder app's [Settings] menu: [Menu >
Settings > Transducer]
2. If your installation required you to install an all-in-one transducer
backwards (e.g.: this may occur when connecting the transducer to
a trolling motor), then select [Backwards] from the [HV transducer
alignment] option. This ensures that the port and starboard channels
appear correctly orientated onscreen, otherwise keep the default setting:
[Forwards].
3. Select where you want your depth measurements taken from:
i. Below transducer (default) — No offset required
ii. Below keel — Enter the distance between the transducer face and the
bottom of the keel.
iii. Below waterline —Enter the distance between the bottom of your keel
and the waterline.
4. You can configure temperature settings as follows:
i. Enable or disable temperature readings as required.
ii. If enabled, check the temperature reading against the actual water
temperature.
iii. If the current reading requires adjustment, select [Calibrate temp] and
enter the difference between your 2 readings.
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