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In critical areas such as harbours, berths, canals, dredged channels, etc., it may be necessary to make use of a multibeam or multi-transducer system (if not already used), assisted with a side scan sonar system in order to prove the existence or non-existence of the feature being investigated. Enough information must be obtained to confirm that the feature in question does not exist in its charted or reported position. If the feature is non-existent, a report should be made to the regional office, which may then provide additional information as to the source of the charted feature.
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