Position: not available

Marine Surveys:

	All Parameters
	Bathymetry
	Gravity
	Magnetics
	Multi-Channel Seismics
	Seismic Refraction
	Shot-Point Navigation
	Side Scan Sonar
	Single Channel Seismics
	Subbottom Profile

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Airborne Surveys:

Aeromagnetics

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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:

• GEBCO_08 (30 arc-second grid) shaded-relief map
• ETOPO1 Global Relief Model (1 arc-minute grid) shaded-relief map
• Esri Light Gray Canvas
• Esri Ocean Basemap
• Imagery: Esri World Imagery
• National Geographic Basemap (Esri)
• Boundaries/Labels: ESRI World Boundaries and Places

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: 1.4, last updated Dec. 2012