If I'm travelling at 4mph (about 3.5 knots) against a tide of 6 knots, does that mean I will just be going backwards? Or because it's water and I'm on top of it, is that not how it works?
Depends whether the method you've used to measure your speed measures it relative to the water or relative to the ground.
Wiki:
The speeds of vessels relative to the fluids in which they travel (boat speeds and air speeds) are measured in knots
Which implies you'll be going backward relative to a fixed reference point.
@RonnieOatmilk started
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If I'm travelling at 4mph (about 3.5 knots) against a tide of 6 knots, does that mean I will just be going backwards? Or because it's water and I'm on top of it, is that not how it works?