- Depth alarm: An alarm signal – both visual and audible with mute function – should be provided when the water depth is below a preset value.
- Failure or reduction in power supply: Alarm signals, both visual and audible (with mute function) to the navigator on the watch should be provided to indicate failure or a reduction in the power supply to the echo sounder which would affect the safe operation of the equipment.
- Operational controls : The function of range scale selection should be directly accessible. The settings for the following functions should be recognizable in all light conditions:
- range scale; and – preset depth alarm.
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