Furuno CI-80 - Manual (Page 24)

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„
Ground Tracking Mode: Shows absolute ship and tide
movements based on ground. (Bottom echo required.)
„
Water Tracking Mode: Shows movements of ship and tide
relative to near-surface water.
„
Nav-aided Mode: Shows ship’s movement measured by the
external navigation equipment, and the tide movements
based on the nav speed data.
„
Auto Tracking Mode: Uses ground tracking mode when
bottom echo is available. Switches to water tracking mode
(or nav-aided mode) when bottom echo is lost. Bottom echo
is continuously searched for, and if re-acquired the ground
tracking mode is restored.
Setting measuring depths
1. Press the MENU key.
2. Press ◄ / ►
to select DEP menu.
3. Press / to select layer.
4. Press / to set depth.
5. Repeat steps 1-4 to set other layers.
Note that measuring depth can also be set on the echo display.
See next page for further details.