Living Document Notice
Staged 2026-09-28. Living revisions and interconnected notes live in the Bosun PKM Garden.

Mark-Roundings, Inside Overlaps, and Fleet Traffic Management

Navigating congested windward and leeward marks demands early approach preparation, zone overlap awareness, and clean exit execution. Tactician structures mark-rounding playbooks and traffic management strategies.

Rounding Invariants

  • Three-Length Zone Overlap Rules: Determining inside overlap status prior to the zone entry boundary governs mark-room entitlements.
  • Approach Setup and Wide-in / Tight-out: Optimal trajectory mapping prevents velocity loss during high-density mark roundings.
  • Exit Lane Acceleration: Securing clear air immediately following mark exit allows rapid acceleration away from congested traffic.

Clean mark-roundings prevent costly penalty turns and recover critical boat lengths during congested legs.


  • Directus Target: tactician-blog
  • Garden Source Reference: MOC - Tactician Racing Engine, MOC - Fleet Operations, SCG-1002 - Cargo Weight and Trim