Honestly, I'm surprised by "follow the river" as a flight instruction. That sounds like the directions you'd get from someone that doesn't understand cardinal directions. "Turn right at the gas station, then turn left at the big oak tree" or something.
I have no experience with flying, but I assumed it would be a heading / cardinal direction and not "turn right at [landmark]"
I have no experience with flying, but I assumed it would be a heading / cardinal direction and not "turn right at [landmark]"