The map below shows standard ports
and secondary ports
with tide predictions available.
For other secondary ports
average time differences are given. The time differences are from the
2011 edition of the
ANTT and are based
on the most appropriate standard port. Select a standard port from the map
below to see the time differences for the secondary ports (if any) related
to it. You then need to submit the details about the location and date for
your request (see above) to obtain the tide predictions.
and secondary ports
with tide predictions available.
For other secondary ports 
average time differences are given.