How can poor weather impact navigation in steep terrain?

Reduced Visibility

Poor weather conditions such as heavy snowfall, dense fog, or strong winds can severely limit visibility in steep terrain. In such cases, it’s essential to rely on other navigation methods, such as using a compass, map, and GPS. When visibility is reduced to 100 feet or less, it’s crucial to slow down and move cautiously, using trekking poles or ice axes for support.

Increased Risk of Crevasses

Steep terrain often features crevasses, which can be difficult to detect, especially in poor weather. It’s essential to use crevasse rescue techniques, such as the “anchor-and-attachment” method, to secure ropes to the terrain before crossing. This involves anchoring ropes to solid ice or rock formations and attaching them to a harness or pulley system. When traversing steep terrain in poor weather, it’s recommended to use a rope system with a minimum of two ropes, one for anchoring and one for self-arrest.

Terrain Assessment and Routing

When navigating steep terrain in poor weather, it’s essential to assess the terrain for potential hazards, such as steep drop-offs, loose rock, or hidden crevasses. Use a combination of visual observation, map interpretation, and experience-based judgment to determine the safest route. Consider avoiding steep terrain altogether and opting for more stable routes, such as traversing across the slope rather than climbing up it. Always maintain a safe distance from the edge and be prepared to retreat if conditions become too hazardous.