Disambiguation
"Wind Watcher"
There is no item called "Wind Watcher" in OSRS. You are likely confusing two different things.
Did you mean?
Wind Catcher
Tier 2 Sail Upgrade for speed.
Watchdog
Plugin for AFK alerts.
1. Wind Catcher
If you are looking for the Sail Upgrade that increases your ship's speed, you mean the Wind Catcher.
It requires 45 Sailing and provides a +15% speed boost.
Read the Wind Catcher Guide →2. Watchdog Plugin
If you are looking for the RuneLite Plugin that "watches" your game and plays a sound when your Crystal Extractor is full, you mean Watchdog.
Read the Watchdog Guide →