Applying the Rule(s) and comments:
In accordance with Rule 7 (a) (Risk of collision), every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist. Comments: All available means which could be used to determine risk of collision on board are: (i) observing compass bearing of approaching vessel, (ii) observing relative bearing of approaching vessel, (iii) observing bearing and range of approaching vessel using radar, (iv) observing data plotted by ARPA radar (CPA and TCPA).
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