Terrain Analysis: Complex Relief and Night Orienteering at Antalya O-Fest 2025. Event: Antalya O-Fest, Night-O, Lara ( 10/29/2025). Turkey. Organising clubs Eon Tours Extremely complex terrain with no clearly defined relief-based navigational lines. As a result, navigation relied heavily on numerous bearing sections. However, the terrain was filled with many similar-looking features — depressions and hill tops — making it very easy to confuse one with another. Night conditions added an extra level of challenge. The already difficult navigation was further complicated by a tricky course layout and the presence of many visible headlamps from other runners moving chaotically in all directions. To better highlight the complex terrain structure, I marked one of the index (thicker) contours in blue on the map. This makes the subtle relief forms more visible and helps better understand the challenge. Altogether, this made the competition a very technically demanding event. Ev...
Case Study #1: Last Navigational Line Perpendicular to Leg Line Example from the Wispa O-Cup 2025 (Polan), D 35 course Organising clubs Harpagan Orienteering Club This leg 7-8 presents a classic example where the final navigational line—represented by a road—is positioned perpendicular to the leg line. This setup increases the risk of losing positional confidence right before attacking the control. The course setter uses this configuration to challenge our route planning and force us to make strategic decisions to maintain reliability. The network of rides and roads in this area offers no bends or junctions that could serve as positioning points. On their own, these lines do not provide enough information to confirm our location. We can only determine our position with the help of other features located off these lines. However, these offline features are similar to each other (in the diagram, simplified depressions are shown), and under speed, fatigue, or pressure, it’s...