http://www.stormy.ca/tides/index.html

"Worldwide - Permanent

Fed up with spending a fortune on Tide Tables? Need the tides
for your landfall? Ever tried buying tables for Canada or the U.S.
when you're in the Caribbean getting ready to sail North? Ever
wondered why there isn't one set of tables for the whole of the
English Channel or the whole of the Eastern American seaboard?

Here's some tidal prediction software that covers the world
and is valid forever!"

If you don't have a computer on board, print out the Tables
in your home or office before you go sailing!

New up to Version 2.32

* Validity: Permanent, within limits of astronomical data
* Geography: over 800 ports worldwide
* Languages: English, français, Español
* Help: on screen in your choice of language
* Colour or Black and white screen (may be more visible on
some LCD's)
* Uses J2000 for latest astronomical data
* Calendar: converts Julian/Gregorian as needed for historical
research
* Probable accuracy: average 10mins / 10cm
* Search capability: by Name, by Latitude or by Longitude
* Latest update: 2 January, 1998, Version 2.28 (NT and
European DOS compatibility
* Version 2.28 also added several "print to file" routines
(registered versions only)
* Version 2.29 15 Jan 2000 included an extra "Lows only" print
routine
* Version 2.30 28 September 2000 fixed a menu overlay problem,
cosmetic only
* Version 2.31 25 June 2001 fixed a rarely occurring error in
the astronomical calculations
* Version 2.32 1 December 2002 refined the mathematics around
tidal stands

YMMV -FWIW