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I want to take a picture of a trail map, then overlay it on google maps or somehow use it as a navigation image linked to GPS? I want to do this all on the phone, while i'm hiking/walking about and encounter a trail map. How can i do this?

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Generally speaking app recommendations are considered off-topic here as outlined in the FAQ. If you can edit your question to make it more of a "how do I do this" question rather than a "is there an app that can" question you'll probably be safe. – newuser May 13 '11 at 15:01
up vote 2 down vote accepted

Sounds like you Custom Maps is exactly what you're after.

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Locus supports that by a built-in function On Board Map Calibrator.

You can overlay and calibrate any picture over any map source supported by Locus.

On Board Calibrator

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