RaceBox
English
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As you sail away from the starting line, your TTB will be increasing rapidly, just as when
you are reaching away from the end of the line in a reach out reach back start. The
difference is that your centerline will be intersecting the starting line, so the Race Box
will be targeting the actual starting line, not one of its ends.
Once again, when the TTB hits 15 seconds (or however long it takes you to gybe your
boat), gybe around and head back to the line. Sail at your optimum wind angle straight
for the line, or perhaps a bit lower for extra speed. The centerline of your boat,
projected forward, should be intersecting the starting line, and the Race Box is targeting
that intercept point. Your TTL, TTB and distance to line is all based upon the distance
you have to sail on your current course over ground to cross that line, and the speed at
which you are currently sailing.
5.4.4
Other starting strategies
These examples are designed to give you an understanding of hat the Race Box does
in certain situations during the start. Of course there are any number of different ways
to approach a starting line. The Race Box can assist, as long as you keep in mind how
it works so you can interpret the data it presents to you. As with any instrument, its up
to the crew to interpret the data to put it to best use.
5.4.5
Connecting a GPS Receiver
The Race Box can accept GPS data from the Nexus server or directly via its own
NMEA 0183 ports.#
If you have a NMEA 0183 GPS connected to the Nexus server via the servers NMEA
port, the server will report position, speed over ground and course over ground to the
Race Box at a rate of approximately 1 update every two seconds.
If you have a Nexus nGPS connected to the Nexus network bus, the server will report
position at a rate of two updates per second and speed and course over ground at 5
updates per second.
You can also connect a NMEA 0183 GPS directly to the Race Box. The Race Box will
accept the NMEA 0183 RMC and ZDA sentences at a baud rate up to 57,600 baud and
an update rate up to 5 times per second.
To hook it up, remove the outer lid and connect the GPS NMEA 0183 or RS-422 output
to port RX1 on the Race Box. As with the other connections, be careful not to over
tighten the screws. Make them just finger tight. Near the upper right hand corner of the
circuit board, you will see two jumpers. One of these is labeled “USB.” Move the jumper
shunt so that inner pin and middle pin are connected. Replace the outer lid.
Finally, a change to the configuration file needs to be made. Please refer to “Other
Configuration Options” and then “Position Data Source” below for details.
Содержание RACE BOX
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