Youv are both right. You're just saying it different ways.

Airliners have to manage the same crosswind issues that anglers manage while following structure. Your compass will always be pointing north but the stong west wind will be blowing your boat "sideways" to the east at the same time. It's referred to as "sideslipping" by most. Pilots also have to manage the rotation of the Earth. Glad we don't have to factor that in too!

So, to maintain your bearing as you travel north you have to compensate for the westerly wind by establishing a NW heading with your Autopilot. This will position your boat somewhat sideways to the stucture you're trying to hold on but your general heading will now be following the structure you're trying to stay on.

Imagine the computer monitor in front of you is the target you're trying to move towards in your boat (let's call this North). Imagine a strong westerly wind coming in from the left. Place your hand on the table in front of you and have your fingers pointing at about 10 o'clock. Now, push your hand straight towards the monitor. This is "sideslipping". You should point your Autopilot at the 10 o'clock landmark (this is approximate of course) and this will make your boat travel towards the monitor because you factored in the crosswind.  Subtle changes in crosswind speed and changing the speed of your trolling motor all affect the result of where your boat will ultimately go.

Sounds confusing at times but still beats the thunder out of having to constantly steer the trolling motor while fishing. I only have to make small periodic adjustments to speed and direction with the autopilot. Love it!  Wouldn't trade it for anything!

Hope this helps a little....