Map display is compressed on certain Apple devices

[Maprunner]

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After a bit of searching around it looks like this is a very specific iOS problem: http://stackoverflow.com/questions/11929099/html5-canvas-drawimage-ratio-bug-ios

Esentially certain versions of iOS calculate the image height incorrectly for "large" jpg files.

The best "solution" in the short term is to keep the map file size down when creating the event. Using GIF instead of JPG might help. Also there is no need to go over about 200 dpi when creating map images.