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Old 29-12-2012, 10:54   #16
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Re: What ship's time do you keep?

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There must be some other acronym for local zone time.
Yes its called Nautical Time, essentially a zone every 15 degrees of Long. unlike land based time zones it basically ignores countries
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Old 29-12-2012, 10:57   #17
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Re: What ship's time do you keep?

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Originally Posted by daddle View Post
Nobody uses LMT underway. Well maybe that parchment chart and astrolabe guy does. LMT would need to be updated every few miles. It's related to solar time or the local apparent time. There must be some other acronym for local zone time.
LMT isn't the correct phrasing, I suppose. "Local time"
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Old 29-12-2012, 11:01   #18
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Re: What ship's time do you keep?

As a said the correct term is Nautical Time, for example on the Queen Mary Crossing I did ( dont you know) , the time was advanced one hour each morning as the ship covered approx 15 degrees at such a northerly latitude in approx 24 hours.
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Old 29-12-2012, 11:24   #19
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Re: What ship's time do you keep?

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Originally Posted by goboatingnow View Post
As a said the correct term is Nautical Time, for example on the Queen Mary Crossing I did ( dont you know) , the time was advanced one hour each morning as the ship covered approx 15 degrees at such a northerly latitude in approx 24 hours.

To be more precise, we use Zone Time(unless adjusted for DST) for the log, which I think is the same as Nautical Time.
Zone 0 (Z) covering longitudes 7.5E to 7.5W, then in 15 degree intervals east and west of this zone.
My Dad did tell me of ships he had been on when the clocks were adjusted on board so that 12:00 ships time coincided with meridional passage of the sun, sounded a bit of a PITA.
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Old 29-12-2012, 11:29   #20
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Re: What ship's time do you keep?

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Originally Posted by nigel1 View Post
To be more precise, we use Zone Time(unless adjusted for DST) for the log, which I think is the same as Nautical Time.
Zone 0 (Z) covering longitudes 7.5E to 7.5W, then in 15 degree intervals east and west of this zone.
My Dad did tell me of ships he had been on when the clocks were adjusted on board so that 12:00 ships time coincided with meridional passage of the sun, sounded a bit of a PITA.
Zone time is similar , it is the terrestrial version of Nautical time ( zone)

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Old 29-12-2012, 11:30   #21
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Re: What ship's time do you keep?

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My Dad did tell me of ships he had been on when the clocks were adjusted on board so that 12:00 ships time coincided with meridional passage of the sun, sounded a bit of a PITA.
I think that might have been true on most sailing ships and some of the old slow moving tramp steamers that would not have changed nautical time zones very quickly, unlike a fast express steamer or liner.
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Old 29-12-2012, 11:37   #22
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Re: What ship's time do you keep?

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I think that might have been true on most sailing ships and some of the old slow moving tramp steamers that would not have changed nautical time zones very quickly, unlike a fast express steamer or liner.
Well he was on one sail trading ship, and on a lot of slow tramp ships. The one which got him riled was this happening on a passenger ship (RML Andes), which was not a slow ship, think the Capt may have been holding on to the old days, bit like some of us with our sextants and paper charts
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Old 29-12-2012, 12:25   #23
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Re: What ship's time do you keep?

I misstated LMT, I intended to say local zone time, and there is no confusion with regards to log entries, plotting positions on a regurlary scheduled basis, it is very clear. Us astrolabe guys don't have a problem with operating on that level. We aren't all dead yet.
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Old 29-12-2012, 12:39   #24
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Re: What ship's time do you keep?

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Us astrolabe guys don't have a problem with operating on that level. We aren't all dead yet.
We will get to that state of affairs eventually.
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Old 29-12-2012, 13:23   #25
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Re: What ship's time do you keep?

I am going to keep hanging around just out of pure cussedness.
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Old 29-12-2012, 13:37   #26
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Re: What ship's time do you keep?

GMT is boat time while offshore, local time when within vhf range (coastal). I use GMT as a constant for daily weatherfax and navtex scheduling. The daylight shift while travelling east/west is gradual so not allowed to be a concern.
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Old 29-12-2012, 13:39   #27
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Re: What ship's time do you keep?

On my passages from Hawaii to the PNW we stay on Hawaii time until to get to the entrance to San de Fuca. We make the switch during one of the 6 hour watches. No problems.
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Old 29-12-2012, 13:49   #28
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Re: What ship's time do you keep?

We will take off with the local time and then roll.

I always try to move the clock so that my mate's night rest time is one hour longer. If sailing the other way, I will try to make her day watch one hour shorter. We always arrive with the new local time onboard.

One old Casio is kept close to the radio. This one is set to GMT as this is when our radiofax arrives.

I often thought a clock that would smoothly self-adjust to our gps location would be nice to keep the rhythm of the tricks and the daylights.

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Old 29-12-2012, 13:59   #29
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Re: What ship's time do you keep?

UTC and local.
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Old 29-12-2012, 14:15   #30
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pirate Re: What ship's time do you keep?

Quote:
Originally Posted by daddle View Post
Nobody uses LMT underway. Well maybe that parchment chart and astrolabe guy does. LMT would need to be updated every few miles. It's related to solar time or the local apparent time. There must be some other acronym for local zone time.
Its usually refered to as 'Opening Time'....
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