Hi, a bit of a random one this. Charles Wregg (or Wragg) was born at sea in 1824.
Doddie
FindMyPast has a record set "British Armed Forces and Overseas Births & Baptisms". Originally they were 3 separate record sets -
a. British nationals born overseas 1810-2005
b. British nationals armed forces births 1761-2005
c. Births at sea
Charles falls under b) above. His records read "Woolwich" in the column headed "Place"and can be obtained via the GRO quoting "line No." as reference.
He has 2 records - with Line nos 118 and 7.