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For more information about Marine Geophysical Trackline Data at NGDC, see http://ngdc.noaa.gov/mgg/geodas/trackline.html.

Geomagnetic data at NGDC: http://ngdc.noaa.gov/geomag/data.shtml

Basemap and reference layers:

Map projection: WGS84 Arctic Polar Stereographic; EPSG:3995.

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: 1.6, last updated May 2013