unit 2.a.objective and specifications of hydrographic surveys captain m k barritt rn, vice chairman...
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Unit 2.a.Objective and specifications of hydrographic surveysCaptain M K Barritt RN, Vice Chairman IHOCBC
“Trust in God and the Admiralty Chart”Nineteenth century hydrography and the expansion of trade
Where am I and where is my destination?
Where can I go safely?
Look for the clues on the chart
New Ships push the limits with old surveys
The US Capitol Building & Grand Princess to scale.
Pushing the margins of safety
Critical evaluation of the chart is essential“It’s in colour so it must be true!”
The importance of source data
• The mariner must be able to judge whether the information in the chart is adequate for safe navigation for his ship.
• A source diagram, supplemented by guidance in a Mariners Handbook, helps him to do this.
The importance of source data
The importance of a prioritised national survey plan
• Defined with input from the chart user.
• Reflecting agreed priorities to meet SOLAS obligations.
• Including routine re-surveys to deal with areas of unstable seabed.
• Expert committee reporting back to NHC.
SURVEY STATUSSURVEY STATUS
The importance of a prioritised national survey plan
Adequate surveys are a Governmental responsibility under SOLAS V
• Needs NHC oversight.• Needs a customer committee to help define
prioritised survey plan.• Some or all parts of the data collection and
management process can be outsourced.• IHO and its RHCs can advise.