Plotting with variation and deviation (T-V-M-D-C)

Bowditch Ch. 23 §2301

Bowditch Ch. 23 §2301 — Navigational Errors Navigational errors arise from instrument error, observation error, plotting error, computation error, and the basic assumption that the vessel has held the planned course. Cumulative errors must be checked against fixes whenever possible.

Bowditch Ch. 25 §2501

Bowditch Ch. 25 §2501 — The Practice of Marine Navigation Pre-voyage planning is the foundation of safe navigation. Plot intended track, identify hazards within 0.5 nm, mark turn points and parallel index lines on radar, calculate ETAs at each waypoint, and brief the bridge team.

33 CFR §164.38

§ 164.38 § 164.38 Automatic radar plotting aids (ARPA). (a) The following definitions are used in this section— means material in any quantity that is shipped, stored, or handled without benefit of package, label, mark or count and carried in integral or fixed independent tanks. means a stage of construction where— (1) The keel is laid; (2) Construction identifiable with a specific ship begins; or (3) Assembly of that ship has commenced comprising at least 50 tons or 1 percent of the estimated mass of all structural material, whichever is less. means— (1) A flammable liquid as defined in 46 CFR 30.10-22 or a combustible liquid as defined in 46 CFR 30.10-15; (2) A material listed in table 151.05 of 46 CFR 151.05, table 1 of 46 CFR 153, or table 4 of 46 CFR Part 154; or (3) A liqui…

33 CFR §164.78

§ 164.78 § 164.78 Navigation under way: Towing vessels. (a) The owner, master, or operator of each vessel towing shall ensure that each person directing and controlling the movement of the vessel— (1) Understands the arrangement of the tow and the effects of maneuvering on the vessel towing and on the vessel, barge, or object being towed; (2) Can fix the position of the vessel using installed navigational equipment, aids to navigation, geographic reference-points, and hydrographic contours; (3) Does not fix the position of the vessel using buoys alone (Buoys are aids to navigation placed in approximate positions either to alert mariners to hazards to navigation or to indicate the orientation of a channel. They may not maintain exact charted positions, because strong or varying currents…

33 CFR §164.80

§ 164.80 § 164.80 Tests, inspections, and voyage planning. (a) The owner, master, or operator of each towing vessel of less than 1,600 GT shall ensure that the following tests and inspections of gear occur before the vessel embarks on a voyage of more than 24 hours or when each new master or operator assumes command: (1)A test of the steering-gear-control system; a test of the main steering gear from the alternative power supply, if installed; a verification of the rudder-angle indicator relative to the actual position of the rudder; and a visual inspection of the steering gear and its linkage. (2)A test of all installed navigational equipment. (3)Operation of all internal vessel control communications and vessel-control alarms, if installed. (4)Operation of all navigational lights an…

46 CFR §16.105

§ 16.105 § 16.105 Definitions of terms used in this part. Link to an amendment published at 89 FR 93134, Nov. 25, 2024.Link to an amendment published at 89 FR 102340, Dec. 17, 2024.means a scientifically recognized test which analyzes an individual's breath, blood, urine, saliva, bodily fluids, or tissues for evidence of dangerous drug or alcohol use. means a service agent who provides or coordinates the provision of a variety of drug and alcohol testing services to employers. C/TPAs typically perform administrative tasks concerning the operation of the employers' drug and alcohol testing programs. This term includes, but is not limited to, groups of employers who join together to administer, as a single entity, the DOT drug and alcohol testing programs of its members. is a term used to…