The relevance of positioning, navigation and timing for success in maritime operations has grown significantly. Yet, satellite-based PNT - GNSS - fallibility raises resilience concerns, especially in Navigation Warfare environments and confined water spaces. Therefore, we initiated an experimental study on resilience performance under GNSS disruption by understanding how navigation teams deal with those conditions. Participants are pilotage teams from the Portuguese Navy playing scenarios in a navigation simulator. The study intends to correlate performance with other measurements on experience, training, knowledge, attitudes, behaviors, cognition and procedure compliance (for piloting and post-disruption actions). The study aims to provide insight into teams and success factors in the face of GNSS disruption, effectively appraising the positioning resilience of the Portuguese Navy.