Navigational warnings on 2011-05-23

What this reporting period contains

9 messages have issue dates in this period, and 15 have cancellation dates in it. A cancellation can close a message issued earlier; subtracting these totals does not give a count of new incidents.

9 recorded messages form a small sample; the category breakdown should be read as individual records rather than a pattern.

9 recorded messages form a small sample; the source series breakdown should be read as individual records rather than a pattern.

Separate updates to the same activity count as separate messages. The original records below show what was reported and when.