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Explains the 200/83 kHz DualBeam PLUS™ sonar system.
Details the Down Imaging® technology with razor-thin beams.
Describes XD transducer for extreme depth coverage.
Explains the various keys and their functions for operation.
Explains the interpretation of sonar data and returns.
Explains how to interpret the images produced by Down Imaging®.
Defines and explains how to use waypoints, routes, and tracks.
Covers saving, creating, and deleting waypoints.
Instructions on how to navigate to a selected waypoint or position.
Provides shortcuts to frequently-used settings.
Standard menu settings organized under tabbed headings.
Precautions for cleaning and caring for the control head.
Addresses power-up problems and transducer connection issues.
Solutions for display issues and lack of fish detection.
General| Brand | Humminbird |
|---|---|
| Model | 688ci HD DI |
| Category | Sonar |
| Language | English |
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