I sank the paddle into the river. The main current V'd ahead of us, and looked to be straight, as far as I could tell, though the V that indicated the fastest water disappeared about halfway along down the rapids.
"Call the rocks," I hollered. "We want to go straight down the middle." (Deliverance, James Dickey)
Please explain "The main current V'd ahead of us".
Please explain "Call the rocks". Thanks. --- tk