Boat & River — Relative Velocity
River speed v
r
(m/s)
(+x, downstream)
Boat speed (w.r.t. water) u (m/s)
Heading angle θ (°)
from +y (across): + downstream, − upstream
Auto-aim for zero drift (if u ≥ v
r
)
Auto-aim not possible: boat speed is less than river speed.
Play
Pause
Reset
Ground frame (lab)
Vx (m/s)
0.00
Vy (m/s)
0.00
|V| (m/s)
0.00
Angle to horizontal
0.0°
Angle to across (+y)
0.0°
Time taken
—
Drift (m)
—
Total distance traveled
—
Water frame (boat wrt water)
u
x
(m/s)
0.00
u
y
(m/s)
0.00
|u| (m/s)
0.00
Heading from across
0.0°
Heading to horizontal
0.0°
Boat cannot make progress across (Vy ≤ 0). Adjust θ or u.