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DP Station-Keeping Footprint

DP-operated vessel's station-keeping circle radius under environmental load, per IMCA M103 footprint test.

MASSDP

Wind lateral forcekNCurrent forcekNWave drift forcekNAvailable thruster side forcekNFootprint gain (m per kN over-capacity)m/kN

Total environmental force

250kN

Thruster margin

150kN

Approximate footprint radius

0.50m

Formula, assumptions, and limits

IMCA M103 footprint test measures maximum excursion at a held heading in given wind/wave/current. Negative margin = thrusters saturated → unbounded drift. Positive margin gives the station-keeping capability plot per IMCA M140.

Symbol legend

Meaning	Unit	Source
Total environmental force	kN	CFD / OCIMF tables
Available side thrust	kN	thruster sum × efficiency
Empirical footprint gain	m/kN	vessel-specific