Furuno CI-68 Operator's Manual page 32

2. INTERPRETING THE DISPLAYS
Tide for three layers/tide differential
2.3 140
®
2.3 140
(3) Displayed when echo for a measuring layer is not present. The readout for the offending
measuring layer is not reliable.
(4) Displayed when the depth setting for a measuring layer is improper. The readout for the
offending measuring layer is not reliable.
Improper depth setting conditions
Depth in ground tracking mode is less than 10 m.
Depth setting is more than 75% of actual depth.
Echo cannot be obtained because of air bubbles, etc.
Echo for set depth cannot be found because depth has become deeper than set
depth.
2-12
Tide and tide differential error displays
2.3 140
®
2.3 140