Furuno FEA-2107 Operator's Manual page 146

8. Vector Chart Material
How seasonal features are coded in vector charts (S57)
Some chart producers may define a chart feature to use seasonal date start and end as shown below.
• YYMMDD (Full date for date start and date end)
• --MMDD (The same date every year)
• --MM (The same month every year)
The example below shows how a user can find, using Info query (seasonal), the full date for starting date
(YYYYMMDD).
The example below shows how a user can find, using Info query (seasonal), the full date for ending date
(YYYYMMDD).
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