There is a difference between היקף and סביב (surround): The verb היקף refers specifically to a complete surrounding, but the verb סביב also refers to an incomplete surrounding. If it wants to indicate that it will be a complete surrounding, the word will be repeated - סביב סביב, or it will use it as a verb, like וסבותם את העיר הקף (And you shall compass the city, all the men of war, going about the city once)⁶⁶⁶.

footnotes: ⁶⁶⁶ Joshua 6:3.

And the word סביב is correct if it will be surrounding with four sacrifices or with two dashings of blood from a vessel on two diagonally opposite corners of the altar.