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3-6 Raychart 320 Chartplotter
Tide Data
The symbol indicates that Tide height data is available for that
position on the chart. When you select the Tide height option, a graph of
predictions for maximum and minimum tide heights is displayed. Data
for sunrise and sunset are indicated by vertical bars as shown in
Figure 3-4.
Note: The predictions available are sufficiently accurate under moder-
ate weather conditions, for the coastal areas served by the reference sta-
tion, to be used for navigation planning. However, certain weather fronts
and storms can alter tidal patterns and influence predicted times and
heights.
Figure 3-4: Tide Data Information
The cursor, represented by a dotted vertical line on the graph and
controlled by the trackpad, is used to select a time for which the tide
height is displayed.
You can use the soft keys to change the date for which tide information is
shown.
➤ To select a time, use the trackpad to move the cursor to the required time.
➤ To change the day press PREV. DAY, NEXT DAY or TODAY, as required.
Alternatively, press
SET DAY. To change date, use the trackpad left/right to
select the character and up/down to increase/decrease the value, then
press
ENTER to accept the value.
The graph and tide data are updated accordingly.
PREV DAY TODAY
SET DATE
NEXT DAY
CURSOR
0 2 4 6 8 1012141618202224
TIME 13:30
HEIGHT 4.06m
SELECTED DATE
2/01/1999
0.71
1.36
2.01
2.66
3.31
3.96
4.61
CALSHOT CASTLE
D4904-2
Twilight
Start
Twilight
End
Sunrise
Sunset
Cursor
81167_3.BOOK Page 6 Wednesday, November 21, 2001 2:12 PM