Which navigational exploit became achievable when Vikings employed advanced square sail rigging?

💡 Explanation

Superior close-hauled sailing, using modified square sails, became possible because the improved sail trim allowed for higher angles relative to the wind through aerodynamic lift, therefore allowing further upwind progress, rather than just downwind sailing or rowing.

• Which outcome results when Byzantine weighted silk drawloom designs degrade?
• Which navigational error grows when using a sextant?
• Which risk increased during collapses of medieval rope bridges when timber footings saturated?
• Which adjustment was required using an early Islamic astrolabe to accurately determine prayer times at different terrestrial locations?
• Which outcome results when poorly designed terraces overload the supporting soil, due to prolonged saturation after periods of heavy rainfall?
• Which stabilization mechanism prevented collapse in steeply-walled Late Roman castra?