Which switch turns on the fathometer depth sounder?

Which switch turns on the fathometer depth sounder?

• A. On
• B. Power
• C. Start
• D. Reset

Answer: (B)

The key idea is that you must supply electrical power to the fathometer to turn it on. The switch labeled Power is the one that energizes the instrument, completing the circuit to the boat’s electrical system so the depth sounder can start operating. Without powering it, other actions won’t run. Once the unit is powered, you could use other controls to begin readings or adjust settings, but those won’t turn the device on by themselves. Reset typically clears data or resets alarms, not power. A label like On might exist on some panels, but the essential control to wake the fathometer is the Power switch.

The key idea is that you must supply electrical power to the fathometer to turn it on. The switch labeled Power is the one that energizes the instrument, completing the circuit to the boat’s electrical system so the depth sounder can start operating. Without powering it, other actions won’t run.

Once the unit is powered, you could use other controls to begin readings or adjust settings, but those won’t turn the device on by themselves. Reset typically clears data or resets alarms, not power. A label like On might exist on some panels, but the essential control to wake the fathometer is the Power switch.