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Simrad ES80 Installation Manual
Supported datagram formats for distance information
In this maritime context, distance refers to the physical travelled distance the vessel has
made since the sensor was last reset. A suitable external sensor must be provided. A
global positioning system (GPS) with a compatible output format can also be used. When
enabled, the navigational information on the top bar includes a read-out of the vessel's
travelled distance.
The ES80 supports the following datagram format for vessel distance
information.
•
NMEA VLW
The NMEA VLW datagram contains the travelled distance of the vessel. Two values are
provided; relative to the water and over the ground.
Related topics
Interface specifications, page 247
Supported datagram formats for drop keel offset information
If your vessel is equipped with a drop keel, the operating depth of the transducer face will
vary. This variation affects the position of the transducer in the vessel's coordinate system.
To make accurate measurements, this offset must be compensated.
The ES80 supports the following datagram format for drop keel offset information.
•
OFS Drop keel
The proprietary OFS datagram contains the current length travelled by the drop keel. The
information is required to establish the offset of the transducer face relative to the vessel
origin. A custom-built sensor may be required for this measurement.
Related topics
Interface specifications, page 247
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