BOTH INTERNATIONAL & INLAND Concerning the identification signal for a pilot vessel, in fog, which statement is TRUE?

Correct Answer: Option C — When at anchor, the pilot vessel is only required to sound anchor signals.

Rule 35(i) specifies that the identity signal of four short blasts is only for a pilot vessel when engaged on pilotage duty. When at anchor, the pilot vessel must sound the standard anchor signals prescribed by Rule 35(g), as the identity signal is not required while anchored.