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.shtmlBasemap and reference layers:
- Shaded Relief (Arctic view): Composite of IBCAO version 3.0 and GEBCO_08.
- Boundaries/Labels: from Natural Earth Data
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