Charts showing me origins of shipping forecast areas: peril at sea (6,4)

I believe the answer is:

relief maps

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'charts' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'me origins of shipping forecast areas peril at sea' is the wordplay.
'origins of' suggests taking the first letters.
'at sea' is an anagram indicator.
The initial letters of 'shipping forecast areas' is 'sfa'.
'me'+'sfa'+'peril'='mesfaperil'
'mesfaperil' is an anagram of 'RELIEF MAPS'.

'showing' is the link.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.

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