Garmin GPSMAP 172C Owner's Manual - Page 68
Main Menu, Tide Tab, Lower Low Water MLLW appears as a solid
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Reference Main Menu: Tide Tab Station Name Date Tide Chart Main Menu-Tide Tab Event Times You can select from a list of nearest stations. 58 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 current date and will intersect the tide graph to show their relation. Max. Level High Tide Curve Current Tide Height Bar Min. Level Current Time Box Low Tide Curve Day Night 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 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.