Garmin GPSMAP 172C - Manual (Page 68)

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 172C) and
nighttime (dark bar or blue on 172C) 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, vertical line (with the current time box at the top) will indicate the time of day when using cur-
rent date and will intersect the tide graph to show their relation.
The tide curve shows as a shaded area, with higher tides being taller (blue on 172C) and lower
tides shorter (red on 172C). The solid, horizontal line (with the current tide box on the left) indicates
the current 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 down-
ward, 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.
Day
Night
Current Time Box
Max. Level
Min. Level
Current Tide Height Bar
High Tide Curve
Low Tide Curve
Main Menu:
Tide Tab
Event Times
Tide Chart
Main Menu—Tide Tab
Station Name
Date
You can select from a list of
nearest stations.

Reference