USBL Spin Test
Acoustic Positioning · Offset Spin Check
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1 · Data
Drop survey export
.txt / .csv · click to browse · or paste below
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Column mapping
— auto-read from header
Beacon Easting
Beacon Northing
Beacon Depth / Z
(optional)
Vessel Easting
(optional)
Vessel Northing
(optional)
Heading
(optional)
2 · Known beacon point
(optional)
Known Easting
Known Northing
Known Depth / Z
Leave blank to skip. When E & N are entered the report adds the offset (ΔE, ΔN, 2D & bearing) from the known point to the computed mean.
3 · Parameters
Units
US ft
metre
Rejection distance
Graph half-size
Tolerance ring 1
Tolerance ring 2
Range & rings use the same unit as your data. Fixes whose radial range ≥ rejection distance are excluded from the edited mean.
4 · Job header
Title
Vessel
Date
Project
Notes
Logo
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—
—
Project
—
Notes
—
Vessel
—
Date
—
Raw data average · beacon
Value
σ (1σ)
Easting
—
—
Northing
—
—
Fixes total
—
Edited data average · beacon
Value
σ (1σ)
Easting
—
—
Northing
—
—
Depth / Z
—
—
Fixes accepted
—
Known point → mean offset
Offset
ΔEasting (mean − known)
—
ΔNorthing (mean − known)
—
2D distance
—
ΔDepth
—
3D distance
—
Vessel — average position
Value
σ (1σ)
Easting
—
—
Northing
—
—
2D dist → mean beacon
—
2D dist → known beacon
—
—
Radial spread · DRMS (edited)
—
2DRMS · 95% (edited)
—
Raw → edited shift
—
Fixes rejected
Spin scatter · accepted vs rejected fixes
Accepted
Rejected
Tolerance rings
Mean position
Known point
ticks = offset from mean · equal scale (1:1)
Spin overview · vessel track around beacon
Vessel fixes
Vessel mean
Mean beacon
Known point
Range vs fix index · drift & rejection check
Within tolerance
Beyond rejection
Rejection limit