On Wed, 20 Aug 2008 08:38:11 -0400, "Skip Gundlach"
wrote:

We believe we can know where we are and where we're going. However,
we *don't* have access to the sites which show actual and forecasted
*currents* - which will allow us to maximize any benefit or minimize
any detriment, if possible.

People navigated for many years without access to online tide and
current data. One of the classic sources is Eldridge:

http://www.landfallnavigation.com/-bp002.html

Reed's Nautical Almanac is another classic source and has a lot more
than tides and currents:

http://www.landfallnavigation.com/reeds.html

There are also some nifty electronic sources such as Maptech Offshore
Navigator which is a charting package that also has real time tide and
current data in convenient form. Furuno's NavNet hardware has similar
capabilities and there are probably more that I don't know about.