Time Differences:

To determine the time of high and low tide at any location listed in this table, look at the columns headed “Time Differences” in which the hours and minutes to be added or subtracted from the time of high or low tide at the Miami Harbor Entrance are listed. A plus sign (+) indicates that the tide at the location occurs later than at the Miami Harbor Entrance and the difference should be added; a minus sign (-) indicates that it is earlier and should be subtracted. To get the current tides at Miami Harbor Entrance

Height Differences:

The height of the tide, referred to the datum of nautical charts, is obtained by means of the height ratios (indicated by an asterisk *). To obtain the height of tide at the location, multiply the height of tide at the Miami Harbor Entrance by the ratio listed. The result is normally rounded to the nearest 0.1 foot.