Which VFR chart is not suitable for navigation purposes?

The VFR Flyway Planning Chart is specifically designed to assist with planning flight routes around busy airports, providing visual references for pilots to avoid airspace congestion and adhering to recommended flight paths. While it highlights potential flyways, it lacks the detailed topographical features and navigational aids found on charts designed for actual navigation.

On the other hand, VFR Terminal Area Charts, VFR Sectional Charts, and VFR Tactical Navigation Charts provide comprehensive information essential for navigation, including terrain, obstacles, airspace boundaries, and navigational aids, making them suitable for in-flight navigation. Thus, while the VFR Flyway Planning Chart is a useful planning resource, it is not intended for direct navigation during flight, leading to it being the correct choice for this question.