Thanks Robert.  I'll check into the software you recommend.

I have Tide Tool on my Palm powered Garmin IQ 3600, a combination PDA and
mapping GPS I used to carry with me everywhere.  It's how I find my way when
traveling to parts of North America I've not visited before.  I keep it
loaded with street software consistent with the unit's use.  I find Tide
Table to be excellent for those that have a need to know tide details.  For
many here in south Florida, the ability to clear fixed bridges is dependent
on the tide, a use I don't think you mentioned.

All of my marine GPS units, also Garmin products, also have charting
capability.  Garmin Blue Charts, the proprietary charting software includes
information on all sorts of places of interest, including tide stations.  It
has the added advantage of being able to help you chose the tide station
closest to your present location or, if you prefer, to the location of the
cursor on a displayed chart.  Very handy.

Recently, I had problems with the IQ 3600.  Figuring that repair was going
to exceed the value of the unit, I replaced it with a Windows Mobile based
Garmin IQM5.  As you might imagine, the Windows product is more compatable
with the Windows XP and 2000 systems on my various disktop and notebook
computers.  One of the downsides is that there does not seem to be a version
of Tide Tool for Windows based PDAs.  If you happen to come across one, I'd
be interested.

A side word in favor of Garmin.  While my IQ3600 was clearly out of
warranty, when I reported my problem to Garmin, they replaced the unit free
of charge.  My only cost was the minor expense of shipping the unit to them.
Had I even thought they might be so generous, I probably would not have
bought the M5.  On the other hand, they reminded me of one of the reasons
why I consistently chose Garmin GPS products.  I currently have 7 of them,
Gekos my wife and I use on our bicycles (we take them with us when crusing
to places we are not familiar with) and our ATVs (nice to be able to
backtrack your way our of the Everglades), a 60 CS color charting GPS for
our 15 foot boat and dinghy (both of which are used for exploring places we
visit), an older GPS MAP 2015 and a newer GPS MAP 2006 on the 32 foot
cruiser and the two PDA based units I already mentioned.

Lee