EXACT
POSITIONING WHEN COASTING
By
using a sextant and horizontal angles. Take three shore
marks as widely seperated as possible, and measure the
angles between them. On a sheet of tracing paper make
a dot to represent ship's position and lay off the angles
from it using great care. If the paper is then laid
on the chart and shuffled around until the three lines
cut the shore marks, the ship's position can then be
pricked through the dot with a point of the dividers.
(SAIL
AFRICA)
LOOK
ASTERN
When
coasting in well-buoyed waters, look astern often, both to
check on course being made good and to familiarize with the
appearance of the buoyage from a different angle.You may have
to return by that route some day. Look astern as often as
you look ahead when on watch. In miserable weather one tends
to huddle in a fixed position. (SAIL AFRICA)
ASSESSING
LEEWAY
If a sheet of paper can be 'laid' in the water so that it
floats flat instead of blowing away, it can be seen for some
distance as it is left astern. This provides a useful mark
for back bearing which can be compared with couse steered
in determining leeway made. (SAIL
AFRICA)
DOG
- BARK NAVIGATION
(Echo timing): The use of a reliable echoe from steep cliffs,
buildings etc. in fog can give rough distance off. An echoe
is the period in time taken for a sound made aboard (bell,
fog horn or gun, etc.) to reach the shore and be bounched
back again. the time is converted into distance with the formula
.09 x time = distance off in miles. Sound travels at about
1,100ft per second or .18 miles per second and so the distance
off is one half the total distance travelled by the sound
wave. For a rough quick estimate one can multiply the total
time in seconds by .9. An even rougher guide is 10sec = 1
mile. Fog can distort or soften an echoe and wind can also
render the meathod valueless. (SAIL AFRICA)
DISTANCE
OF HORIZON
| Height
of eye in feet |
0.8 |
3 |
7 |
12 |
19 |
27 |
4 |
| horizon
in nautical miles |
1.0 |
2 |
3 |
4 |
5 |
6 |
8 |
(SAIL
AFRICA)
SPEED
OF DEPRESSIONS
In
forecaster's terminology:
Slowly: 0-15knots
Steadily: 15-25knots
Rather quickly: 25-35knots
Rapidly: 35-45knots
Very rapidly: over 45knots
When at sea and considering a bolt for nearest shelter
it is important to know the expected speed of a low
and it's direction relative to own position. Shelter
may be too far away for the time available; for example,
a low centred 200 miles away and closing at 40 knots
gives just over 5 hrs: 25 miles at a possible 5 knots.
(SAIL
AFRICA)
BAROMETER
RATE
.06 inches in 3 hours: storm impending
.15 inches in 3 hours: strong storm
.30 inches in 3 hours: extreme storm
(to convert to milibars: pressure in inches x 33.86). (SAIL
AFRICA)
HIGH
LAND SQUALLS
When anchored close under high land look out for squalls.
the cold upper air of mountain slopes seeks the lower level.
(SAIL AFRICA)
ONSHORE
WIND
(Meeting a cliff): In rising over the cliff the turbulance
and loss of strength can be felt at up to 7 times the
height of the cliff (if it is sheer) to seaward. Wind
will funnel into a cove with increased strength. (SAIL
AFRICA)
OFFSHORE
WIND
(Coming over a cliff): The shelter effect extends up to 30
times the height of the cliff seaward. (SAIL
AFRICA)
GOING
BACK ABOARD AT NIGHT
If the yacht is anchored
with open sea beyond her, and to leeward of her, beware
the return aboard with a following breeze and at night.
The breeze can be stronger than you think and impossible
to row against with a full load should you overshoot
or fail to grab hold safely. Make an experimental turn
back upwindwhile still well upwind of the anchored yacht;
only carry as many people in the dinghy as will allow
you to row upwind. To go along side, turn the dinghy
head to wind before dropping down on the yacht stern
first. This also applies to strong, fair tidal current
conditions. Don't rely 100 per cent on an outboard motor.
At night always have anchor, bailer and torch aboard.
(SAIL AFRICA)
HUG A BIGHT, SHUN A POINT
A London river pilotage saying. When working a sailing vessel
up a tide, the bays and inlets are followed tight round to
take advantage of back eddies while points are given a wide
berth because the current runs harder than them. (SAIL AFRICA)
WEATHER
JINGLES
If the sun goes pale to bed, rain tomorrow it is said.
Evening red, morning grey, help the sailor on his way.
Evening grey and morning red brings down rain upon his
head.
Clouds like rocks and towers, look for squalls and showers.
Pale moon doth rain, red moon doth blow, white moon
doth neither rain nor snow.
Rain before wynd sheets and halyards mind
Wynd before rain set topsail again.
First rise after low then expect a stronger blow.
Mackeral skies and mares' tails, tall ships carry low
sails.
Long foretold long last, short warning soon past.
When soung travels far and wide a stormy day will like
betide. (SAIL
AFRICA)
If
your stainless - steel cleats, stanchions and other topside
hardware are rusting and difficult to maintain, use ajax,
Zud, Bon Ami, comet, or another such abrasive - based cleaner
as a polish. Rinse well after use; then coat with auto paste
wax. (SAIL AFRICA)
If
you are cleaning teak with a powder - type brightener, but
the wind blows it away as fast as you can sprinkle, pour it
into a bowl and add some water to create a sort of syrup and
then it will stay where you put it. (SAIL
AFRICA)
Now
and then, take allof your fibre sheets, guys , halyards
and dock lines to a laundromat. Give them a good washing
and thorough rinse. They will not only come out bright
and clean but supple and they'll last longer. Be sure
to remove all shakels though or they'll beat the hell
out of the washer, dry the lines in fresh air - not
in a dryer.
(SAIL
AFRICA)
To
reseal a gun - type tube of caulking compound to preserve
the remaining contents and to prevent the nozzle from jamming
with hardened compound, turn a machine screw into the nozzle
hole. The screw should be slightly larger than the hole. (SAIL
AFRICA)
If
you're having trouble keeping your turnbuckles, anchor shakles,
rudder pintles and hatch hinges lubricatedno matter how often
you spray them with "magic slick"....try using water
- pump grease. It seems to old up forever. (SAIL
AFRICA)
Speaking
of grease, during your next haulout, polish your propeller;
then give it a coating of teflon grease. No living critter
can hold onto this stuff, so once the screw begins to turn,
even barnacles let go. (SAIL
AFRICA)
Every
now and then, pour a shot of cooking oil or break fluid (hydraulic
oil) into your marine toilet, especially if it's difficult
to pump. This will lubricate the seals, "o" rings,
and moving parts. This will improve the toilet's operation
dramatically and reduce repairs. Do not use lube oil. (SAIL
AFRICA)