Tree guide initially terminates navigation guides (3,7)

I believe the answer is:

map legends

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'navigation guides' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'tree guide initially terminates' is the wordplay.
'tree' becomes 'maple' (maple is a kind of tree).
'initially' suggests taking the first letters.
'terminates' becomes 'ends' ('end' can be a synonym of 'terminate').
The first letter of 'guide' is 'g'.
'maple'+'g'+'ends'='MAP LEGENDS'

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I've seen this clue in the Sydney Morning Herald.

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