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 2010 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. See also the cautionary note