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961 Operations and Reference Manual Rev. D
the times of high and low tide (some days don't have two
•
full tide cycles due to the time of the first high tide, as
illustrated above)
the scale range
•
On the tide graph, the light gray/dark gray vertical bars repre-
sent nighttime hours; the light yellow/dark yellow bars repre-
sent daytime hours. The red vertical line represents the
present time. Initially, the 961 displays tides for today's date
and the present time; to view the tides for past or future dates,
press the CURSOR PAD to highlight the day and date, then
press the LEFT or RIGHT ARROW keys to view past or future
dates, respectively. To view the tides for past or future hours,
press the CURSOR PAD to highlight the hour (e.g., 03), then
press the LEFT or RIGHT ARROW keys to view past or future
hours, respectively. To view the tides for past or future min-
utes, press the CURSOR PAD to highlight the minutes (e.g.,
46), then press the LEFT or RIGHT ARROW keys to view past
or future minutes (in 5-minute increments only), respectively.
For a selected a tide station, the TIDE STATION bar at the bot-
tom displays the distance and bearing to the selected tide sta-
tion, as well as its lat/lon coordinates and TDs.
For a selected a tide station, the scale-range reading can be
used to determine a precise mean low water depth reading,
printed on the chart, for that particular day. In most cases, you
add a positive number to the water depth printed on the chart.
On some days, however, the tide graph may have a dashed
black line at the bottom; this line is called the zero mark. The
presence of a zero mark means that the mean low depth of
water on the chart isn't the lowest tide height for that particu-
lar day. If you're at this type of location, you should add the
negative number shown on the tide-graph scale range (for
example, -0.19 feet) to the water-depth number shown on the
chart (for example, 20 feet) to get a corrected water-depth fig-
ure (for example, 19.81 feet).
To select tide stations other than the one nearest your vessel,
see below.
Chapter 12 - Alarms, TideTrack, and Currents
Page 12-11
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