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Welcome to the new version of the Trackline Geophysical Data Viewer. Please send any questions or comments to
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For more information about Marine Trackline Geophysical Data at NCEI, see

Geomagnetic data at NCEI:

Basemap and reference layers:

Map projection:WGS84 Web Mercator (Auxiliary Sphere); EPSG:3857.

Disclaimer: All international boundaries, maritime boundaries, and placenames are shown for general orientation and reference only; they do not necessarily represent official U.S. policy.

Version: 1.7.6, last updated May 2015

Please send questions or comments to: or