Garmin GPSMAP 178 Owner's Manual page 82

Reference
Station Name
Main Menu—Tide Tab
You can select from a list of
nearest stations.

Tide Tab— shows a graphical chart which displays tide station information in a 24 hour span
starting at midnight. 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, and the date. The bottom of the chart
shows a 24-hour block of local time for your position. Daylight (light bar or yellow on 178C) and night-
time (dark bar or blue on 178C) show across the time scale, with the time progressing from left to right.
(Local time scales and sunrise/sunset info may not be available for a few stations). The solid, light vertical
lines are in 4-hour increments, and the light, dotted vertical lines are in 1-hour increments. A solid, verti-
cal line (with the current time box at the top) will indicate the time of day when using current date and
Date
will intersect the tide graph to show their relation.
Tide Chart
Event Times
Current Tide Height Bar
The tide curve shows as a shaded area, with higher tides being taller (blue on 178C) and lower tides
shorter (red on 178C). The solid, horizontal line (with the current tide box on the left) indicates the cur-
rent tide height. The figure to the left of the line will show the current tide level. The Mean Lower Low
Water (MLLW) appears as a solid, horizontal line near the bottom of the chart (This line will only appear
if the tide ranges to the zero value or below). The numbers on the top and bottom of the left side indicate
the maximum/minimum levels, respectively. The four data fields below the chart, indicate event times
and levels at which the tide changes starting in the upper left field, going downward, then to the upper
right and down again. When comparing with other tide tables, be sure the depth unit value is the same
for both sources.
Max. Level
High Tide Curve
Min. Level
Low Tide Curve
Day
Night