Boletim ao Mar is an iPhone application developed by Servicos e Informacoes do Brasil, available for free in the Lifestyle category under the Weather subcategory. The app aims to provide essential and reliable information for navigating Brazilian jurisdictional waters safely. It sources data from the Brazilian Navy's Directorate of Hydrography and Navigation (DHN), offering crucial insights for those heading to the Brazilian coast, South Atlantic oceanic areas, and inland waterways.

This app is designed to gather and disseminate up-to-date information on navigation safety products routinely produced by DHN. Boletim ao Mar plays a direct role in supporting hydrography, oceanography, cartography, marine meteorology, navigation, and nautical signaling activities.