Something I'm working on – an app to download and view nautical wind forecasts for Greek waters.

Use the front page to select an area and time, and you can download either one map, or a whole day's worth:

The maps are stored offline for use when sailing and out of range of the internet. They can be browsed by forecast date:

.. or viewed full-screen, with pinch-zoom controls and the option to browse through the folder:

This is a work in progress.