GPS program with spoken offroad route directions?

Can anyone suggest a program which will talk me round a pre-planned route?
I currently do a lot of hiking, and use memory-map to plan out my route before I leave the house, and can compare my location at any time on my phone. I'm now looking to start cycling a bit, and it would be nice to be able to leave my phone in my pocket, and be told left and right etc.
A fair amount of this will be off-road, which rules out all road navigation software.
It doesnt matter if the app supports maps or not, just that it will take a route in some format such as gpx or mmo, and give out verbal instructions which are practically useable.
Thanks in advance.

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