Which vessel has a responsibility to avoid impeding safe navigation according to Rule 9?

According to Rule 9 of the COLREGs, which pertains to the conduct of vessels in narrow channels and straits, a vessel navigating in a narrow channel has the obligation to avoid impeding the safe passage of other vessels that can only navigate safely within that channel. This rule emphasizes the importance of ensuring that vessels that are constrained by their drafts or that have limitations in navigable waters can proceed without hindrance.

In this context, vessels navigating in narrow channels must be mindful of other vessels' safe navigation, particularly those that may have less maneuverability or are restricted in their movements. This obligation ensures safe and efficient traffic flow within these constrained waterways, minimizing the risk of collisions and ensuring that all vessels can operate safely.

The other options revolve around vessel types or operational conditions that do not inherently carry the same responsibility under Rule 9. While a vessel operating at high speed, a vessel under tow, and a vessel limited in draft have their own navigational considerations, they do not hold the primary responsibility of avoiding the impediment of safe navigation within the narrow channel as dictated by this specific rule.