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Text Box: Hemisphere. Negative longitudes apply to the Western Hemisphere. Direction and Speed gives the heading and relative speed in knots over the water. On a boat, this is the direction you would read from the compass and agrees with the Compass reading. The speed is the forward boat speed you would get from a speed indicator or knotmeter on the boat. The True Direction and True Speed (in knots) gives the actual direction and speed the boat is moving due to side slip of the boat and current drift. Wind and Current This provides a digital depiction of the wind and current speed and direction. Consistent with meteorological practice for wind - the direction in degrees is the direction from which the wind blows. Consistent with oceanography practices for current - the direction is that toward which the current is flowing. Sky Condition Window This window gives a computer generated depiction of the sky based on the cloud cover at the boat’s position and approximate time of day. Thus, this provides a visual clue to whether it is day, night , sunrise or sunset and some visible feedback on the weather conditions. To avoid palette conflicts it is covered under certain conditions. Sail Trim This window provides a depiction of sail trim. The sail can be adjusted using the in/out buttons below the window. This in turn affects the speed of the boat. When the boat sails too close to the wind a text box indicates a luff. This can be corrected either by trimming the sails, if you are not already hard on the wind, or by falling off by turning the boat. For near direct downwind sailing conditions, the jib may be blanketed by the main causing a reduction in boat speed. When this happens either gybe away from the direct downwind direction by turning the boat toward the wind or you may set a spinnaker and continue on the downwind course. If you try to sail too close to the wind with the spinnaker set, a text window will indicate spinnaker collapse. Windex This window shows a mast head wind indicator with the head of the arrow pointing into the wind. This gives a direction relative to the boat. The top of this figure is toward the front of the boat. This is the traditional way wind information is viewed by sailors. If the tail of the arrow moves very far inside of the line limits indicated then you are sailing too much into the wind or some say too close to the wind.