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The AIS (Automatic Identification System) is a maritime navigation safety communication system that transmits data, such as vessel location and identification, both to nearby vessels and to coastal facilities. Unfortunately, AIS spoofing is a growing concern: malicious actors could transmit false AIS messages in order to mislead vessels and potentially cause accidents. In this work, we developed a tool for AIS message validation. Under evaluation, the tool delivered promising results in terms of AIS spoofing detection and prevention, thereby demonstrating the tool's efficacy and potential to complement existing detection and prevention techniques.