The Gulf of Mexico Alliance is developing a Gulf of Mexico Master Mapping Plan as part of the Governors' Action Plan II for Healthy and Resilient Coasts. The major components of the mapping plan are: a comprehensive assessment of requirements for high-quality, high-resolution elevation and imagery data including repeat intervals for collection, collation of ongoing mapping programs at the federal, state, and local levels and within academia that may address these requirements, a gap analysis between the mapping requirements and programs to identify which mapping needs are currently unmet, and a strategy to not only acquire baseline data, but to establish a program of mapping to support the goals of the Alliance throughout the Gulf of Mexico.