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Reference
Tide Tab— shows a graphical chart that displays tide station information in a 24-hour span starting at
midnight station time. You can choose from different dates and over 3000 tide stations around the USA
coastline, Alaska, Hawaii, western Canada and several of the Caribbean islands.
The top of the page displays the tide station being referenced, below that the date. The top of the
chart shows a 24-hour block of local time (LCL) for your position, with the reported station time (STA)
appearing at the bottom. Daylight (light/yellow bar) and nighttime (dark/blue bar) show across the time
scale, with the time progressing from left to right. (Local time scales and day/night info may not be avail-
able for a few stations). The solid, light vertical lines are in 4-hour increments, and the light, dotted verti-
cal lines are in 1-hour increments. A solid, vertical line (with the current time box at the top) indicates
the time of day when using current date and intersects the tide graph to show their relation.
The tide curve shows as a shaded area, with higher tides being taller and lower tides shorter. The
solid, horizontal line (with the current tide box on the left) indicates the current tide height. The fi gure
to the left of the line shows the current tide level in feet. The Mean Lower Low Water (MLLW) appears as
a solid, horizontal line on the chart (This line only appears if the tide ranges to the zero value or below).
The numbers directly below/above ‘LCL’ and ‘STA’ indicate the maximum/minimum levels, respectively.
The four data fi elds below the chart, indicate event times and levels at which the tide changes. When
comparing with other tide tables, be sure the the depth unit value is the same for both sources.
Main Menu—Tide Tab
Station Name
Date
Tide Chart
Event Times
You can select from a list of
nearest stations.
Local Time
Station Time
Day
Night
Current Time Bar
Max. Level
Min. Level
Current Tide Height Bar
High Tide Curve
Low Tide Curve
GPSMAP178CManual.indd 72 3/19/2004, 3:10:39 PM