12-21-2015, 02:18 PM
Most likely the best approach lacking accurate time is to refer to the DR Log book that was being kept and make an assumption from the last accurately known time and position (assumed position or fix). From the last accurate position or fix, estimate the further course and speed of your vessel to provide a MPP (Most Probable Position).
Estimate the number of hours from the last fix/position based on vessel speed and distance to obtain a new time to reset your "chronometer" to. This assumes you've got a knot and Distance meter that work.
This shows the need for a backup of the time keeping system. Carry several watches and check and compare them often. Reset as necessary.
It won't be accurate but if you've in the middle of the Atlantic headed to France land will not be immediately ahead.
Hailing another boat or ship might work? Ask 'em what time it is.
Clendon
Estimate the number of hours from the last fix/position based on vessel speed and distance to obtain a new time to reset your "chronometer" to. This assumes you've got a knot and Distance meter that work.
This shows the need for a backup of the time keeping system. Carry several watches and check and compare them often. Reset as necessary.
It won't be accurate but if you've in the middle of the Atlantic headed to France land will not be immediately ahead.
Hailing another boat or ship might work? Ask 'em what time it is.
Clendon