Captain Crisp
Active member
Have I gone mad or is my North Sea Passage Pilot wrong? I thought the tide in Calais was 50 mins after Dover (ie +0.5 not "- 0.5")
Am I missing something?
Am I missing something?
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Calais tide Pilot Book error...?
- Thread starter Captain Crisp
- Start date
MontyMariner
Well-known member
Today HW
Calais 03:43 16:03
Dover 01:59 14:20
I assume times are local so Calais is about 45 mins after Dover.
So it looks like you are right
Calais 03:43 16:03
Dover 01:59 14:20
I assume times are local so Calais is about 45 mins after Dover.
So it looks like you are right
Captain Crisp
Active member
Thought so... That's a fairly hefty mistake for a pilot book...
DFL1010
Active member
It's possible the book is correct. It may be following the convention of zone descriptions rather than offsets (Nautical time - Wikipedia)
I can't get into my Imray Explore account to check, and I don't have a hard copy either.
What (if anything) does the introduction say on this?
Roberto
Well-known member
What does Navily say? 
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Sandy
Well-known member
According to Reeds 2021 Calais is +0048 Dover.
A good navigator should be looking at multiple sources.
A good navigator should be looking at multiple sources.
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DFL1010
Active member
Says he, citing a single source.
Sandy
Well-known member
Indeed, but it is a very, very good one. My copy of Reeve-Fowkes is down on the boat.
MontyMariner
Well-known member
DFL1010
Active member
I remain intrigued-for the OP (or anyone else who has a copy to hand): are there any explanatory notes about that clarify? Also for other ports with respect to Dover, do they follow the same notational logic or no?
I've a chit in with Imray to unlock my explore access but I'm curious.
I've a chit in with Imray to unlock my explore access but I'm curious.
Captain Crisp
Active member
The only thing in the intro seems to be standard + for later, - for earlier:
Captain Crisp
Active member
And it has Dunkirk as - 1
Where in fact the tide is Dover +1hr...
I notice it doesn't give any unit... Maybe that's a clue?
Where in fact the tide is Dover +1hr...
I notice it doesn't give any unit... Maybe that's a clue?
dunedin
Well-known member
Why pfaff around with Almanacs? Use the tide app on your phone, much quicker
jdc
Well-known member
It could be a confusion about Local Time.
Sandy
Well-known member
It was much quicker to open a page on a book beside me than wander downstairs to look at my phone.Why pfaff around with Almanacs? Use the tide app on your phone, much quicker
Onboard the phone is usually off as it serves no useful purpose.
Sandy
Well-known member
Do tides follow time zones?
Blue Seas
Member
It depends on which way you are travelling. If you leave Dover at HW then the next HW you see at Calais will always be later and vice-versa.
jdc
Well-known member
No, of course not. But navigating across time zones is a recipe for confusion unless you always adopt UTC, so anytime I see a 1hr error I immediately suspect it.
Sandy
Well-known member
I am one of the few people I know that always uses UTC onboard no matter what time zone I am in.
Roberto
Well-known member
Me too, bulkhead watches on the boat are all UTC (my PC too, helpful with radio and weather stuff). Wristwatches local time.
I even have a UTC watch at home, it makes guests suddenly look at their watches (cellphones these days) and worry for a fraction of a second if they are too early