Projects: Current Atlas Tables

These tables are for use with the Current Atlas: Juan de Fuca Strait to Strait of Georgia (published by the Canadian Hydrographic Service), and make it easier to use by providing pre-computed tables of chart numbers for any given date and time. Oh, and they're free for non-commercial use!

The results should be similar to Murray's Tables or Washburne's tables, although I've never actually seen those so I'm not sure what other information they provide. My reason for producing these was frustration at the difficulty of finding these books in stock at stores, especially since the data is so easy to calculate.

Consider these tables experimental. Please sanity check them before you use them, and don't rely on them for your only information about currents (this is actually good advice for any use of the Current Atlas, since it is can be way off for places with strong currents). Run a few manual calculations to compare with, or check against Murray's or Washburne's tables if you have them. Please inform me if you notice any significant discrepancies, but look at the two charts first; in many cases charts with very different numbers are actually almost the same.

Here are the tables from 2008 to to 2013. Use the HTML link to view online, and the PDF link for a printable version.

If you would like tables such as these for other current atlases from the Canadian Hydrographic Service, please mail me one and I'll see what I can do. My scripts should be easy to adapt.

In addition to the computed tables, you can download the scripts I wrote to produce them. The bulk of the work was done over a couple of hours one rainy morning, and then some extra time to refine the output and make it presentable.

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