!
! "
Maritime Briefing
Volume 2 Number 7
ISBN 1-897643-38-1
2000
The Importance of the Tidal Datum in the Definition of
Maritime Limits and Boundaries
by
Nuno Sérgio Marques Antunes
Edited by
Rachael Bradley and Clive Schofield
International Boundaries Research Unit
Department of Geography
University of Durham
South Road
Durham DH1 3LE
UK
Tel: UK + 44 (0) 191 334 1961 Fax: UK +44 (0) 191 334 1962
E-mail: [email protected]
www: http://www-ibru.dur.ac.uk
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Vertical clearance - ID
Tidal Gauge - IT
Tidal Levels & Charted Data
IH 20
Charted elevation
HAT
HW datum (or MSL) Charted vertical clearance
MHWS
Charted HW
(coast) line
Spring range of tide
MHWN
Neap range of tide
MSL
Land survey datum
Sea surface at any time
MLWN
Height of tide
MLWS
CD (usually LAT on
BA charts)
Observed depth
(sounding)
Drying height
Charted LW (drying) line
Charted depth
Planes of reference are not exactly as shown for all charts.
L
$
Vertical clearance - ID
Tidal Gauge - IT
IH 20
Elevation of the
light source
PHMA / HAT
PMME / MHWN
Niveau moyen
(NM) MSL
Height
Charted HW
(coast) line
Charted vertical clearance
PMVE / MHWS
Tidal Levels &
Charted Data
Spring range of tide
Charted
elevation
Neap range of tide
Land survey datum
Sea surface at any time
BMME / MLWN
BMVE / MLWS
ZH PBMA
CD LAT
Height of tide
Observed depth
(sounding)
Drying height
Charted LW (drying) line
Charted depth
Planes of reference are not exactly as shown for all charts.
!(
7
$
Tidal Gauge - IT
Tidal Levels & Charted Data
IH 20
Charted elevation
Charted vertical clearance
MSpHW / MHWS
MNpHW / MHWN
Charted HW
(coast) line
Spring range of tide
Neap range of tide
Land survey datum
MSL
Sea surface at any time
MNpNW / MLWN
MSpNW / MLWS
KN
CD
Height of tide
Observed depth
(sounding)
Drying height
Charted LW (drying) line
Charted depth
Planes of reference are not exactly as shown for all charts.
K
$
Vertical Clearance - ID
Tidal Levels & Charted Data
Tidal Gauge - IT
IH 20
PMmáx. / HAT
Height
Charted HW
(coast) line
Charted vertical clearance
PMAV / MHWS
PMAM / MHWN
Spring range of tide
Charted
elevation
Elevation of the
light source
Neap range of tide
NM / MSL
Land survey datum
Sea surface at any time
BMAM / MLWN
BMAV / MLWS
BMmin / LAT
Height of tide
Observed depth
(sounding)
ZH / CD
Drying height
Charted LW (drying) line
Charted depth
Planes of reference are not exactly as shown for all charts.
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9
$
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UNITED
KINGDOM
0
kilometres
50
Oxford Ness
52°00'
Shipwash Sand
Harwich
Equidistant line
Oxford Ness - Zeebrugge
Long Sand Head
Full - effect
Long Sand Head
51°30'
Zeebrugge
Oostende
Dover
Trapegeer
BELGIUM
Dunkerque
51°00'N
Calais
FRANCE
1°30'E
2°00'
2°30'
3°00'
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$
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Oxford
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UNITED
KINGDOM
52°00'N
Felixstone
Shipwash Sand (LTE)
0
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1°30'E
/!%
$
21
$
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Banc Breedt
Banc Small
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51°00'N
F R A N C E
0
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$
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Trapegeer (LTE)
Banc Breedt (LTE)
Banc Small (LTE)
Dunkerque
51°00'N
BELGIUM
FRANCE
0
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$
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51°3'N
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BELGIUM
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2°30'E
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BELGIUM
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$
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$
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