Sail line simulator

Towed-streamer 3D line changes for any survey outline: load a shapefile, set the sail sequence, and check every turn, run-in and run-out.

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Survey outline

Upload a zipped shapefile, or select the .shp and .prj together. GeoJSON also works.

Coordinate units

Using a rectangle. Set its size below, or load an outline.

Paste coordinates instead

Lines Rectangle lengthkm Rectangle widthkm Line azimuth° Line spacingm First line offsetm Shortest line keptm

Vessel and spread Streamers Streamer separationm Streamer lengthm Speedkn Turn radiusm Run-inm Run-outm

Sail sequence Order Lines skipped Flag changes overmin

A line change is timed from the end of one line to the start of the next, run-out and run-in included.

00:00 Speed North up Coverage swath

Line changes

Seq	From → to	Next heading	Turn	Shift (m)	Length (km)	Time (h:mm)	Check