Rule 6
Safe speed
The answers can be found in the respective Rules and Paragraphs in the book"International Regulations for Preventing Collisions at Sea (Colregs) by Capt. Pierre Deseck and/or in the Colregs Presentation (on DVD), also by Capt. Pierre Deseck
Q = Question; A= Answer
Q 6-1
Define the term “safe speed”.
A 6-1
Rule 6 and Par. 6.1 General
Click on safe speed for a summary
Q = Question; A= Answer
Q 6-1
Define the term “safe speed”.
A 6-1
Rule 6 and Par. 6.1 General
Click on safe speed for a summary
Q 6-2
Which factors shall be taken into account by all vessels in determining a safe speed ?
A 6-2
Rule 6 (a) and Par. 6.2 till 6.7.
Click on determining a safe speed for a summary
Q 6-3
Comment the notions “state of visibility” versus “safe speed”.
A 6-3
Par. 6.2, The state of visibility.
Q 6-4
A 6-3
Par. 6.2, The state of visibility.
Q 6-4
Which factors shall be taken into account with regards to the traffic density ?
A 6-4
Par. 6.3, The traffic density.
Click on traffic density for a summary
Q 6-5
A 6-4
Par. 6.3, The traffic density.
Click on traffic density for a summary
Q 6-5
Which are the factors that determine the manoeuvrability of a vessel ?
A 6-5
Par 6.4, The manoeuvrability of the vessel.
Click on manoeuvrability of a vessel for a summary
Q 6-6
A 6-5
Par 6.4, The manoeuvrability of the vessel.
Click on manoeuvrability of a vessel for a summary
Q 6-6
Which "precautionery measures” should you take before you were appointed as chief mate on a large ship or on a ship with unusual manoeuvring characteristics ?
A 6-6
Merchant Shipping Notice No M.1015, Training for masters and chief mates of large ships and ships with unusual manoeuvring characteristics.
Q 6-7
A 6-6
Merchant Shipping Notice No M.1015, Training for masters and chief mates of large ships and ships with unusual manoeuvring characteristics.
Q 6-7
What effect can shore lights or back scatter of the vessel’s ow light have on the identification of navigation lights ?
A 6-7
Par. 6.5, Background lights.
Click on shore lights for a summary
Q 6-8
A 6-7
Par. 6.5, Background lights.
Click on shore lights for a summary
Q 6-8
What are the consequences of the wind, sea and current on a ship proceeding at a reduced speed ?
A 6-8
Par 6.6, The state of wind, sea and current.
Click on wind and sea for a summary
Q 6-9
A 6-8
Par 6.6, The state of wind, sea and current.
Click on wind and sea for a summary
Q 6-9
How will a vessel behave when she has insufficient water under the keel ?
A 6-9
Par. 6.7, The draught in relation to the available depth of water.
Click on insufficient water under the keel for a summary
Q 6-10
A 6-9
Par. 6.7, The draught in relation to the available depth of water.
Click on insufficient water under the keel for a summary
Q 6-10
What is interaction and what are the dangers inherent to it.
A 6-10
Marine Guidance Note, MGN 199 (M), Dangers of interaction.
Q 6-11
A 6-10
Marine Guidance Note, MGN 199 (M), Dangers of interaction.
Q 6-11
Which factors shall be taken into account by vessels with operational radar ?
A 6-11
Rule 6 (b) and Par. 6.9, For vessels with operational radar.
Q 6-12
A 6-11
Rule 6 (b) and Par. 6.9, For vessels with operational radar.
Q 6-12
Which elements determine the efficiency of the radar ?
A 6-12
Statutory Instrument 1993 No. 93, The Merchant Shipping (Navigational Equipment) Regulations 1993, Part IV, Radar Installations.
Q 6-13
A 6-12
Statutory Instrument 1993 No. 93, The Merchant Shipping (Navigational Equipment) Regulations 1993, Part IV, Radar Installations.
Q 6-13
Enumerate the main characteristics which determine the efficiency of the radar.
A 6-13
Par. 6.9.1, Characteristics, efficiency, limitations of radar equipment.
Click on efficiency of the radar for a summary
Q 6-14
A 6-13
Par. 6.9.1, Characteristics, efficiency, limitations of radar equipment.
Click on efficiency of the radar for a summary
Q 6-14
Give the different types of radar equipement that can be encountered on board vessels.
A 6-14
Par. 6.9.1, Characteristics, efficiency, limitations of radar equipment, fourth paragraph.
Q 6-15
A 6-14
Par. 6.9.1, Characteristics, efficiency, limitations of radar equipment, fourth paragraph.
Q 6-15
Comment the choice of range scale to be used.
A 6-15
Par. 6.9.2, Range scale in use.
Click on choice of range scale for a summary
Q 6-16
A 6-15
Par. 6.9.2, Range scale in use.
Click on choice of range scale for a summary
Q 6-16
Describe the interferences that can make some echoes difficult to observe.
A 6-16
Par. 6.9.3, The sea state, weather conditions and other sources of . interference
Q 6-17
A 6-16
Par. 6.9.3, The sea state, weather conditions and other sources of . interference
Q 6-17
What precautions shall you take in coastal waters and in some regions (especially in winter) when performing radar observations ?
A 6-17
Par. 6.9.4, Small vessels, ice and other floating objects.
Q 6-18
A 6-17
Par. 6.9.4, Small vessels, ice and other floating objects.
Q 6-18
Which vessels are required to carry a radar reflector ?
A 6-18
Radar reflectors and SOLAS Regulation 19, par. 2.1.7
Q 6-19
A 6-18
Radar reflectors and SOLAS Regulation 19, par. 2.1.7
Q 6-19
Give the main spacifications to which radar reflectors must comply.
A 6-19 Radar reflectors.
Q 6-20
A 6-19 Radar reflectors.
Q 6-20
What precautionary measurers shall you take when a great number of echoes are detedted on the radar
A 6-20
Par 6.9.5, The number, location and movement of vessels detedted.
Q 6-21
A 6-20
Par 6.9.5, The number, location and movement of vessels detedted.
Q 6-21
Can the radar help you in assissing the visibility ? Explain
A 6-21
Par. 6.9.6, Assessment of visibility.
Q 6-22
A 6-21
Par. 6.9.6, Assessment of visibility.
Q 6-22
What is the degree of confidence you can put in the use of radar as a means to avoid collision ?
A 6-22
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Sub. par 2.1, General
Q 6-23
A 6-22
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Sub. par 2.1, General
Q 6-23
How should you interpret the observed echoes on the radar ?
A 6-23
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Sub. par. 2.2, 2.3 and 2.4, Interpretation.
Q 6-24
A 6-23
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Sub. par. 2.2, 2.3 and 2.4, Interpretation.
Q 6-24
How can you estimate the degree of risk of collision with another vessel ?
A 6-24
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par. 2.5, Plotting.
Q 6-25
A 6-24
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par. 2.5, Plotting.
Q 6-25
Enumerate the factors that should influence your choice of range scales for observation by radar.
A 6-25
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par. 2.6, Choice of range scale.
Q 6-26
A 6-25
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par. 2.6, Choice of range scale.
Q 6-26
How should you use and appreciate radar observations as a means of avoiding collision ?
A 6-26
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par 2.7 till 2.10, Appreciation.
Q 6-27
A 6-26
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par 2.7 till 2.10, Appreciation.
Q 6-27
When is it opportune to practice with radar ?
A 6-27
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par 2.11, Clear weather practice.
Q 6-28
A 6-27
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par 2.11, Clear weather practice.
Q 6-28
When should the radat be kept operational ?
A 6-28
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par. 2.12, Operation, and par 2.13, Radar watchkeeping.
Q 6-29
A 6-28
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par. 2.12, Operation, and par 2.13, Radar watchkeeping.
Q 6-29
What do you know about parallel index techniques ?
A 6-29
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 3, The Use of radar and plotting aids, Par. 2.14 till 2.20, Parallel index rechniques.
Q 6-30
A 6-29
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 3, The Use of radar and plotting aids, Par. 2.14 till 2.20, Parallel index rechniques.
Q 6-30
When and how should the performance of the radar be checked ?
A 6-30
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par. 2.21 till 2.24, Regular operational checks.
Q 6-31
A 6-30
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par. 2.21 till 2.24, Regular operational checks.
Q 6-31
Which additional checks should you perform with a ARPA and ATA ?
A 6-31
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par 2.25 till 2.27, Electronic radar plotting aids (ARPA and ATA).
Q 6-32
A 6-31
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 2, The Use of radar and plotting aids, Par 2.25 till 2.27, Electronic radar plotting aids (ARPA and ATA).
Q 6-32
Should you rely 100% on the GPS and GLONASS system ?
A 6-32
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 4, Global positioning system (GPS).
A 6-32
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par. 4, Global positioning system (GPS).
Q 6-33
What di you know about ECDIS ?
A 6-33
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par 5, Electronic charts.
A 6-33
Marine Guidance Note 63 MGN (M + F), Use of Electronic Aids to Navigation, Par 5, Electronic charts.
About 1500 slides and 50 animations are available on our DVD Colregs Presentation which can be purchased online (click on books or read the books).
Pierre Deseck