Raymarine Pathfinder - Manual (Page 66)

Chapter 13: RayTech advanced features 121
graph plots and data matrices, which can be edited to suit your needs. A
typical polars plot screen is shown below.
Data collection
The accuracy of any analysis presented by the polars tool is dependent on
the volume and accuracy of the data collected. There are two primary areas
within the polars application where you can enter and modify data:
• The Polar tab - this displays the polar parameters screen, which
contains variables/ values used to plot the polar graph.
• The Data tab - this displays the data tests screen, which enables the
input of advanced, boat/weather performance-related information that
you can use to further fine-tune the analysis.
These screens come pre-loaded with default data, however, it is essential
to replace as much of this information as possible with real performance/
atmospheric -specific data. You can use RayTech’s Data Trak and Data
Logging functions to record a wide variety of performance-related data
that is ideal for use with these screens. Data from these screens can also
come from such sources as your boat’s manufacturer and local nautical
organizations.
Entering and editing data
Data is entered using the polar and data parameters tabs.
Polar parameters
To edit the polar parameters:
1. Click
Polar tab in the Polar Plot dialog box.
2. Replace as much of the default data as possible with actual data that
you have collected. You can modify the default values shown, or load
an existing polar parameters file. To modify the values shown, refer to
Step 3.
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122 RayTech RNS V6.0 - Users Guide
To load an existing polar parameters file:
i.
Click Open in the polar parameters box. The open file dialog box
is displayed.
ii. Choose the polar parameters file (.rpl extension) that you want to
open.
iii. Click Open . The selected file will be displayed.
3. To edit individual values:
i. Click on the cell that you want to modify. The value is highlighted.
ii. Enter a new value, click outside of the cell. The new value will be
accepted.
iii. Repeat Steps i and ii for each value you want to change.
4. If you want to view data without saving it, go to Step 5. If you want to
save the data that has been entered either:
5. Click Save . The file will be saved under the current file name, or,
6. Click Save As , if you want to create and name a new polar variables
file.
7. Click Apply to use the new variables in the polar plot.
8. Click the Polar Plot tab to view the new data graph.
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The definitions for the cells in the table are:
Tws True wind speed - in knots
Bsp0
0 Boat speed in knots at zero degrees (sailing directly into the
wind)
TwaUp True wind angle Upwind - in degrees
BspUp Boat speed Upwind - in knots
Twa1 True wind angle - in degrees (first variable)
Bsp1 Boat speed - in knots (first variable)
Twa2 True wind angle -in degrees (second variable)
Bsp2 Boat speed - in knots (second variable)
TwaDn True wind angle Downwind - in degrees
BspDn Boat speed Downwind - in knots
Bsp180 Boat speed - in knots - at 180 degrees (sailing directly with the
wind).