My friends Gary and Jim have between them owned about 12 wooden boats. They have electronic navigation and they have charts; they have quartz clocks and mechanical with bells.
Quartz below left replaced for epic 1500-mile cruise
so we had bells in the night time
And there's a clock above the windshield and one in the PC (which took a dive down the stairs in a storm moment)
Redundancy is your friend on the water, I think.
So buy more clocks!
Cazalea