This paper reassesses the contribution of large-scale language models (LLMs) to the recent zero-shot performance improvements achieved in the ObjectNav system, separating the contributions of linguistic and geometric information. To achieve this, we re-evaluate the InstructNav pipeline in a detector-controlled environment and introduce two training-free variants that only modify the action-value map: the Frontier Proximity Explorer (FPE), which uses only geometric information, and the Lightweight Semantic-Heuristic Frontier (SHF), which uses LLMs via simple frontier voting.