It’s all a matter of experience.
-time of day
-weather
-existing threats
-high listing of boats and U-boats
-Misidentified ships
And many more factors can throw off a range!
Over time you will find YOUR way to range. Mine is not accurate, but gives me a ballpark figure I am comfortable with through any situation. Some guys need to pull out calculators and apps to get the right formula.
I personally like to practice while going in and out of harbors. No pressure.
You will get there. Just keep practicing.
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