Improving a difficult linear traverse around a large curved obstacle (e.g., a lake): When long legs are hard to obtain, which measures enhance traverse accuracy?

Introduction / Context:
Traversing around a large lake or similar obstacle often forces short, awkward legs that can degrade accuracy. Good practice combines redundancy, careful measurement, and auxiliary geometry to maintain reliable coordinates and closure.

Given Data / Assumptions:

• Obstacle prevents long, straight legs.
• Angles and distances can be observed, though legs are short.
• Subsidiary lines are feasible on nearby ground.

Concept / Approach:
Short legs can be used if measurements are repeated (angles and distances) to reduce random errors through averaging. A subsidiary or tie traverse can span around the obstacle or connect distant control to simulate a long chord, improving geometric strength and providing checks. Together these practices enhance precision and reveal blunders.

Step-by-Step Solution:

Verification / Alternative check:
Redundant observations increase degrees of freedom; statistical adjustments (e.g., Bowditch or least squares) then yield improved, defensible results.

Why Other Options Are Wrong:
Each single action helps, but the best practice is the combination, hence “All of the above”.

Common Pitfalls:
Relying on a single short-leg traverse without redundancy; lack of checks conceals systematic errors.

Final Answer:
All of the above