In addition to TWA and TWS, our recent multifunction displays and i70/i70S instruments also offer TWD (true-wind referenced to north rather than the bow.) This requires compass Heading as well as STW.
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What Raymarine refers to as True Wind (TWA, TWS) is always wind-over-water, not wind-over-ground (more on this below.) We calculate this from AWA and AWS, plus speed-through-water (STW, from a paddle-wheel or equivalent.) It's not possible to calculate proper True Wind from GPS speed (SOG.) If you're looking at your wind instrument and you have AWA and AWS but TWS is showing as dashes (-.-kn) then you don't have Speed data coming in. As examples, if you're motoring at 10kn dead upwind into a 15kn breeze, your AWS will be 25kn and your AWA will be 0 degrees (wind on the bow.) On the other hand, if you're motoring dead downwind at the same speed, in the same wind, you'll see 5kn AWS from astern (180deg AWA.) Apparent Wind will vary depending on your boat's motion. This is directly measured by the masthead sensor and doesn't depend on any external data. Ground Wind Direction, GWD) this is relative to North.Īpparent Wind Angle (AWA) and Apparent Wind Speed (AWS) are the default displayed data on dedicated wind instruments such as i60 and predecessors. Apparent Wind Angle, AWA), we mean relative to the bow (0 to 180 degrees port or starboard.) When we refer to something as a direction (e.g. When we refer to a data item as a wind angle (e.g. Various Raymarine displays are capable of displaying a variety of Wind data types, which sometimes cause confusion, so we'll explain a little about what each data type is and what other data is required in order to calculate and display. +- Thread: Apparent Wind, True Wind and Ground Wind, and data required to calculate ( /showthread.php?tid=987)Īpparent Wind, True Wind and Ground Wind, and data required to calculate - Chuck - Raymarine - Moderator - 06-01-16 10:59 AM +- Forum: Instruments ( /forumdisplay.php?fid=117) +- Forum: Raymarine Forums ( /forumdisplay.php?fid=1) Apparent Wind, True Wind and Ground Wind, and data required to calculate - Printable Version
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