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Old 31-12-2011, 09:46   #1
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enc chart depth numbers upper and lower?

basic question.
The numbers show low tide water levels?

what does the lower letter next to the number mean?
I have seen 'g' and some numbers I think.
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Old 31-12-2011, 16:12   #2
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Re: enc chart depth numbers upper and lower?

ok loaded a picture to show you

next to the depth number at an angle
what is 'g' or is it a '9'?
what is '8'
what is '1'
etc...
compared to the depth it must have some meaning
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Old 31-12-2011, 16:29   #3
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Re: enc chart depth numbers upper and lower?

The "g" is a "9".

That is the way decimals are displayed. 12.9 meters, 14.1 meters, etc.
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Old 31-12-2011, 17:49   #4
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Re: enc chart depth numbers upper and lower?

Quote:
Originally Posted by sdowney717 View Post
ok loaded a picture to show you

next to the depth number at an angle
what is 'g' or is it a '9'?
what is '8'
what is '1'
etc...
compared to the depth it must have some meaning
for heaven sake. after reading this, i am definitely going to sell my boat.
i will print this, frame it and hang on my living room wall.
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Old 31-12-2011, 19:26   #5
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Re: enc chart depth numbers upper and lower?

Soundings
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Old 01-01-2012, 05:24   #6
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Re: enc chart depth numbers upper and lower?

thanks, so 131 means 13.1 feet 88 means 8.8

this should be for low tide readings?
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Old 01-01-2012, 05:45   #7
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Re: enc chart depth numbers upper and lower?

Enc charts just adhere to standard chart conventions regarding depth figures etc. Paper charts looks just the same.
I think that you could benefit greatly from reading up on basic navigation.
Consider reading and learning from a good navigation text. Please make sure you understand everything in a chart, before heading out next time!
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Old 01-01-2012, 06:05   #8
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Re: enc chart depth numbers upper and lower?

Quote:
Originally Posted by sdowney717 View Post
thanks, so 131 means 13.1 feet 88 means 8.8

this should be for low tide readings?

I think that is for MLW , mean low water. Not necessarily low tide, I think.

Someone will correct me it I'm wrong.
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Old 01-01-2012, 06:30   #9
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Re: enc chart depth numbers upper and lower?

Quote:
Originally Posted by four winds View Post
I think that is for MLW , mean low water. Not necessarily low tide, I think.

Someone will correct me it I'm wrong.
Near enough.
It's chart datum. Usually lowest astronomical tide (LAT) in tidal waters. According to IHO, prob same in US.

All you need to know here.

U.S. Chart No. 1

or here

Downloads for IHO Member States and Subscribers

It's a good idea to check if the depths are metres or feet
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Old 01-01-2012, 06:38   #10
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Re: enc chart depth numbers upper and lower?

I was going to recommend Chart 1 also, though I forget some of it.

I think MLW applies to rivers in the US.

It's all a blur to me, learning(remembering) all this at an older age is a challenge for me.
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Old 01-01-2012, 10:01   #11
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Re: enc chart depth numbers upper and lower?

Quote:
Originally Posted by four winds View Post
I think that is for MLW , mean low water. Not necessarily low tide, I think.

Someone will correct me it I'm wrong.
Mean lower low water - but always check the title block of the chart to verify.
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Old 01-01-2012, 10:03   #12
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Re: enc chart depth numbers upper and lower?

Quote:
Originally Posted by conachair View Post
Near enough.
It's chart datum. Usually lowest astronomical tide (LAT) in tidal waters. According to IHO, prob same in US.
Not all countries use the same chart datum. Canada uses Lowest Normal Tide.
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Old 01-01-2012, 10:16   #13
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pirate Re: enc chart depth numbers upper and lower?

To the best of my memory depths are shown at MLWS or Maximum Low Water Springs...
In other words... it may be this... but it could be less...
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