The main theme of CoastGIS 2011 is Marine and Coastal Spatial Planning. Some of the conference themes include: mobile GIS in the marine environment; advances in hydrographic survey techniques, tools and technology; open source GIS for coastal/marine applications; management tools for integrated coastal zone management; exploring and managing marine boundaries issues; modelling coastal processes; managing risks in coastal environments; impact of climate change on the coast, coastal communities and marine resources; environmental conservation in the coastal zone; sustainable use of coastal resources; integrating coastal and river basin catchment data; disaster monitoring and mitigation at the coast; informing and involving the public in coastal decision making; marine spatial planning and monitoring; and socio-economic issues affecting coastal communities.