Nexus RACE BOX, Инструкция по установке и эксплуатации

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English RaceBox
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5.4 Perpendicular Mode
If you prefer a simpler method, you can set the Race Box line calculations into
perpendicular mode by setting a line in the configuration like this:
LINE_PERF_ONLY=Y
Doing this changes how the Race Box calculates your distance to the line. The distance
is still from the bow, but it is always along a path that is perfectly perpendicular to the
starting line or its extensions. Regardless of your current heading, this distance will
always be calculated straight to the line or its extension.
Some people prefer this method of calculating line distance. However, this mode
deceases the accuracy of the data reported.
5.4.1 Starting examples
Here are some commonly used starting strategies, with an explanation of what the
Race Box will do.
5.4.2 Reach in, reach out start
One of the simplest starting techniques is the reach out, reach in technique. Simply
enough, you reach along the line and as you pass the end, you note the time remaining.
Subtract the time required to gybe around, divide by two and you know how many
seconds before you need to head back.
Let's assume you are to the left of the pin end, reaching toward it. As you approach it,
the Race Box will be selecting the pin as its target and telling you DTL, TTL and TTB
based upon how far that pin is away from your bow. The pin is targeted because your
centerline is not intersecting the start line.
As you pass the pin, still on course for the other end of the line, the Race box will
continue to target the pin until your bow is half way down the line. At this point, the other
end of the line becomes closer and the Race Box switches to target that end. DTL and
TTL decrease as you approach the boat end of the line.
When you pass the committee boat, the Race Box will continue to target it and TTL and
DTL will increase. TTB will be decreasing rapidly at this point, since you are moving
away from the line and the clock is ticking down. Let's assume you know that it takes
about 15 seconds to gybe the boat and head back to the committee boat for a start.
Watch the TTB. When the TTB indicates 15 seconds, its time to gybe. After you do,
head straight back to the boat end of the line and the TTB will indicate approximately 0
all the way back to the committee boat.
5.4.3 The Vanderbilt start
Similar to the reaching out and back start is the Vanderbilt start. You sail away from the
starting line on a broad reach, then at the right time turn around and beat back to the
line.