THERE ARE TWO KINDS OF DOWNLOADS HERE WITH EXCEL AND QUATTRO PRO VERSIONS FOR EACH KIND
1. A Tide and Current Calculator that is set up to use in the San Francisco Bay and Delta area.
2. A Half Tide Calculator which includes a page with a "Per Minute" change calculator. These calculators can be used anywhere in the world where you have the High Tide Time and Height and the Low Tide Time and Height.
An example of how the Half Tide/Per Minute Change calculator would be useful is when you are planning to go to a Marina with a low tide entrance depth of 3 feet and your boat draft is 5 feet, 2 inches. If the Half Tide time is not deep enough for your boat to enter then you will need to calculate the time for a depth that is more than your boat's draft. The "Per Minute" change calculator allows you to do that.
Another example is when you are in the same marina and you want to leave at the earliest time you can in the morning and Low Tide is at 0700. Half tide may give you sufficient depth but if not, the "Per Minute" change page that is part of the Half Tide Calculator will allow you to find the earliest time you can leave based on the depth you want under your keel.
1.3 Knot Flood Current on San Francisco Bay
Tide
& Current Calculator
EXAMPLE
OF THE INPUT SCREEN This example is only in two colors to
make it easier for you to see what entries are required. The file you choose to download is much
nicer looking with multiple colors. THE REQUIRED ENTRIES ARE IN RED
Get Free Program By Clicking The Download Button Below The Version You Want
Excel Version (tc-calc-e.xls)
Quattro Pro Version (tc-calc-q.qpw)
Half Tide & Per Minute Change Calculator
Low Tide At Richmond Yacht Club Marina (-1.2 ft.)
Click A Download Button Below To Get This FREE Calculator!
Excel Version (halftide-permin-calc.xls)
Quattro Pro Version (halftide-permin-calc.qpw)
The Calculators, above, give you the times and heights numerically.
They are not graphic like chart below.
This site was last updated 10/02/09