WinTide is a linear tide clock for Windows 3.0 that let's you estimate the present or predicted relative tide height, and the times of the next corresponding high and low tides. A red arrow shows whether the tide is rising or falling. You need only to enter a previous high tide date and time for the location you're interested in monitoring. The WinTide graphic, which also can be displayed as an icon, uses the rule of twelves, also called the rule of one-two-three, to depict relative water height between high and low tides. This rule states that during the first and sixth hours between high and low tides the water rises one-twelfth of the total height each hour; during the second and fifth hours two-twelfths; and during the third and fourth hours three-twelfths. WinTide assumes a 24 hour and 50 minute tidal day and therefore uses six hours twelve minutes and 30 seconds as the average time between high and low tides. Since it does not use more sophisticated methods of calculation, WinTide should be used only as a tide estimator. For more accuracy you should use tide tables or a more sophisticated tide program. We live next to a tidal body of water and find WinTide useful.