This narration is not a normal one.
I’m using in my narrations a lot of abbreviations and special terms, which are understood by sailors. As I know that there are many people without sailing knowledge are reading these narrations, I decided to add a glossary of terms. Here you can find always explanations on the terms and especially the abbreviations I’m using.
TWS True Wind Speed – the speed measured any position at land or sea where the position may not move. On board of a boat this wind speed is calculated using satellite data.
TWA True Wind Angle – the angle equivalent to TWS.
AWS Apparent Wind Speed – the wind someone stands on boat feels. The wind the sails feel. This wind is measured on the top of the mast.
AWA Apparent Wind Angle – the angle equivalent to AWS.
STW Speed Through Water – the speed a boat makes through the water. It is measured just outside of the hull.
SOG Speed Over Ground – the speed with which the boat moves over the ground of the globe. It is calculated from satellite data.
COG Course Over Ground – the course (direction) in which the boat moves over the ground of the globe. It is calculated from satellite data.
WPT Waypoint – point along the route a boat sails. Each WPT had a pair of coordinates that determines its position on the globe or on the sea chart (digital or paper)
BTW Bearing To Waypoint – the direction under which the WPT is located; being seen from the boat.
DTW Distance Too Waypoint – the distance of the waypoint from the boat.
PRT – Port or Port side – the left side of a boat when looking from stern to bow.. Color is red.(The red heart is at the left side of a human body.)
STB – Starboard or Starboard side – the right side of a boat when looking from stern to bow. Color is green.
NM Nautical Miles – distance unit for navigation. 1 NM is the equivalent distance of 1 angular minute of a longitudinal circle around the globe (these circles go through the North and South pole).
KN Knot – a speed unit for which means the NM per hour.
As Nautical Mile and Knot are not an ISO units, they don’t have an internationally fixed abbreviation. Thus one can find other abbreviations as well. I’m using the ones here in capital characters because they are not in conflict with any ISO units.
Sails
Every sailboat can have different sails but almost always have a main sail and one head sail.
The main sail – or short the”main” is the big 3-angular sail behind the mast.
The head sails – are always before the mast. Head sails can have different sizes and thus have different names. MaRe has 3 different head sails.
The genoa – biggest and most often used has 49 m2.
The jib sails – Only a few catamarans can fly jib sails. MaRe has two. A jib with 20 m2 and a storm jib with only 8 m. Depending on wind and direction conditions one jib can be used in combination or instead of the genoa.
Gennaker – this is huge, approx. 120 m2, very colorful sail made out of material also used for parachutes. It is a light wind sail, which I can use for AWA from 70 – 180 deg. (For sailors: I can even fly to 150 deg on the other side with a tack height of 2 m). It is flown in the very front of the boat but can be pulled to the side as well; this depends on the AWA.
Halyards – each sail has its halyard , which is a line to pull the sail up.
Sheets – Each head sail has 2 sheets. Sheets are lines with which a head sail must be adjusted to the AWA.
The main sail has only 1 sheet to adjust the sail to AWA.
Barber Hauler – a special line, which allows to open a head sail more than what is possible using a normal sheet. I use this typically when I only the genoa and have winds between about 150 – 180 deg AWA.
Autopilot – it is a computer, which can steer the boat depending an information it is given and the steering mode being selected
Steering modes are:
STBY – stand-by – the autopilot returns the steering to the person at the helm and does nothing else.
AUTO – the autopilot steers the boat into a direction entered, ignoring wind and current drifts.
WIND VANE – the autopilot steers the boat in a way that the entered AWA determines the direction the boat is going. Thus, when the wind changes direction, the boat follows the new direction.
TRACK – the autopilot steers the boat to a given WPT correcting drifts by currents and wind. This mode can only be used with very stable wind directions or when the boat is running by its engines.
Directions in hours
If one stands somewhere at the boat and wants to tell another person where there is something to be seen, the hours of clock are used. 12:00 is fixed to the bow and 0600 is fixed to the stern. The other hours are distributed around the clock.
E.g. 0300 is on STB at a 90 deg angle from the boat. 0900 is the equivalent on PRT. The others are in between on a logical order.
Compass directions
N north (0 or 360 deg)
NNE north-north-east (22.5 deg)
NE north-east (45 deg)
ENE east-north-east (67.5 deg)
E east (90 deg)
S south (180 deg)
W west (270 deg)
Between each main direction the sub directions equivalent to the ones between N and E exist.
Waves
There are wind induced waves and the swell. Wind induced waves are on top of a swell and are cause by wind closer to the boat. Whereas swell is created in constant winds far away and these waves roll long distances.
(If I’m not wrong there is a good article in Wikipedia: “Douglas Scale” is a pretty good search term. )
I hope that the terms are understood even by non-sailor. At least this was the objective for writing this glossary of terms. Feel free to ask for additional information to skipper-cat-mare@myiridium.net