For your purposes I'd suggest a smartphone of your preferred flavour, although I would suggest you look for something waterproof and durable. Others have suggested good map applications. Pair it with a solar charger and a good sized portable battery pack.
Use the solar charger to keep the battery pack topped up, you can even bodge that onto the top of your backpack so the battery charges while you walk. Top it up every time you have access to mains electricity. Charge the phone from the battery. I would suggest you find the battery capacity of your phone (measured in mAh, milliamp hours) and multiply it by 4 to choose a battery pack.
If you get a dedicated device (perhaps as a back up in case of phone failure?) wait for the next generation of Garmin / Delorme tech, for your purposes it's the only thing that has any advantage over a phone as it give you SOS and satellite comms, could save your skin in a really bad situation. For every other purpose on your trip a smartphone will do. I say the next generation because Garmin's first Delorme device since buying the company doesn't seem very well received, but I've not done a lot of research.
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[ Tim | History - NW Italy/French Rivera, Swiss Alps, Morocco | 2016 - Greece > Albania > Macedonia > Kosovo > Montenegro > Bosnia > Slovenia > Austria ]
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