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    04 - Estimated Position

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    RYA Day Skipper Exercise 4 Estimated Position

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    04 - Estimated Position

    Uploaded by

    vax1
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    RYA Day Skipper Exercise 4 Estimated Position

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    RYA Day Skipper Exercise 4 Estimated Position

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    55 views3 pages

    04 - Estimated Position

    Uploaded by

    vax1
    RYA Day Skipper Exercise 4 Estimated Position

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    RYA Day Skipper

    Exercise 4
    Estimated Position

    USE RYA CHART 3, the area near Sweetwater.


    Use variation 7° W.
    All times are DST unless otherwise shown.

    1. The following is an extract from the logbook of a boat leaving the anchorage marked to
    the east of S. Shaun Island after a family BBQ, to return to Sweetwater (45°43'.00N
    006°12'.10W).

    TimeCo°M Log Depth Wind Baro. Remarks


    1555 350° 0.0 8.2 SE3 1004 Weigh anchor
    1615 350° 1.7 9.5 SE2 1004 DR position. Isolated danger mark
    abeam to starboard. Alter course to 010°
    (M)

    1727 010° 8.1 13.3 SE2 1004 DR position. Cape S. Vincent lighthouse
    abeam to starboard
    Plot the DR positions.

    2. A fishing vessel with engine problems is returning to Hamilton for repairs.

    a) At 1135 the time, position and log reading are recorded in the logbook. The
    position is 45° 38'.40N 006° 24'.50W.

    Plot this fix.

    b) The boat is steering 100°M, making only 4.5 knots.

    Plot the DR position at 1235.

    c) Plot the EP at 1235, if the tidal stream is 349°T 2.0 knots.

    3. A yacht has left Hamilton needing to return to its home port urgently.

    a) At 0750 the GPS position is 45° 38'.20N 006° 15'.00W. The log reading is 4.1.

    Plot this fix.

    b) The yacht is on a heading of 330°M. At 0950 the log reads 13.3.

    Plot the DR position at 0950.

    c) The tidal stream is 174°T 0.8 knots for the first hour and 182°T 1.6 knots for the
    second hour.

    Plot the EP at 0950.

    ©Skippers Online 2015. Source materials licensed from the RYA. Page 1 of 3
    RYA Day Skipper
    Exercise 4
    Estimated Position

    ©Skippers Online 2015. Source materials licensed from the RYA. Page 2 of 3
    RYA Day Skipper
    Exercise 4
    Estimated Position

    11. d) What is the speed over the ground (SOG) of the yacht?
    Is this more or less than the speed through the water?

    Why?

    4. On Saturday 5th October at 1043 an angling boat leaving Sweetwater is 0.6 miles due
    north of the Cape S. Vincent Lighthouse. The skipper has asked the helmsman to steer
    270°M.

    a) What time is HW Victoria?

    Is it springs or neaps?

    Set(°T) Drift(kts)
    b) What is the tidal stream between 1043 and 1143 using
    tidal diamond <M>?

    c) Plot the EP at 1143 if the boat speed is 9.0 knots.

    d) What is the course over the ground (COG) of the boat?

    e) Would the boat clear the reef if her speed were only
    5kts?

    5. On Saturday 31st August a motor cruiser on passage to Hamilton has put the centre of
    the compass rose into the GPS as a waypoint to plot positions quickly.

    a) At 1415 the GPS gives the direction and distance to the waypoint as 192°(T) 3.8
    miles. Plot the 1415 fix.

    b) The heading is 170°(M) at 18 knots. Plot the EP for 1445.

    Use the tidal stream atlas in the Almanac.

    ©Skippers Online 2015. Source materials licensed from the RYA. Page 3 of 3

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