Under the default style they will all be drawn as lines. Ideally the polygons would also have an area=yes tag and you could test for this with a custom style rule. The same problem occurs for man_made=pier. On 3 Feb 2012, at 12:obl42, Roger Calvert <roger@rogercalverts .me.uk> wrote:

The OSM data for the Lake District contains both lines and polygons tagged 'man_made=jetty'. How will mkgmap handle these? Will the first one encountered dominate, or will they be treated independently of each other?

Roger --

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