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A common cause of this, is that your iPhone automatically resizes all of your imported photos and images. In most cases this is a good thing, as it saves space. In the case of maps, however, it reduces quality quite drastically.
There is a workaround for this. When you email the map images to yourself and save them on the iPhone, they will be in a higher resolution.
To save an emailed image, simply hold your finger on the image until you see a popup appear. Select the ‘Save Image’ option and the image will be stored in you Camera Roll. The Camera Roll can be accessed by selecting ‘From library’ as your image source when creating a new map.
We are working on easier ways to get high-resolution maps on your iPhone, but right now, the above is the best solution.
The answer to this question depends a lot on the quality of the map image you are using.
When you have a (near) perfect scan, without perspective distortion, it is fine to use two reference points.
When there is perspective distortion (this is true for all photographs), three reference points give noticeably better results and is therefore recommended.
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