| Project: | Marathon Expedition |
| Instrument: | SeaBeam |
| All Bathy/Relief | Coastal | DEM Portal | Fishing | Global | Lakes | Multibeam | NOS |
| Ship Name: | Thomas Washington |
| Chief Scientist: | Fox, Paul Jeffrey; Forsyth, Donald University of Rhode Island and Brown University |
| Source Organization: | University of California San Diego, Scripps Institution of Oceanography (UCSD/SIO) |
| Start Date: | 1985-04-01 |
| End Date: | 1985-05-01 |
Multibeam Bathymetry

| Project: | Marathon Expedition |
| Instrument: | SeaBeam |

| Number of Files: | 12 |
| Number of Records: | 255009 |
| BATHYMETRY DATA | Quantity | Percentage |
|---|---|---|
| Number of Beams | 4845171 | 100% |
| Number of Good Beams | 3187856 | 65.79% |
| Number of Zero Beams | 1657315 | 34.21% |
| Number of Flagged Beams | 0 | 0% |

| Total Time: | 706.4253 hours |
| Total Track Length: | 15317.4651 km |
| Average Speed: | 21.683 km/hr (11.7079 knots) |

| Northern Extent: | -8.346607 |
| Southern Extent: | -34.48569 |
| Western Extent: | -34.379993 |
| Eastern Extent: | 17.331718 |

| Minimum Sonar Depth | 0 | Maximum Sonar Depth | 0 |
| Minimum Altitude | 0 | Maximum Altitude | 5980 |
| Minimum Depth | 985 | Maximum Depth | 6055 |
File Information

| Files | File Size | Description |
|---|---|---|
| MRTN13WT.SBM.85apr03 | 1.61MB | SIO merge Sea Beam |
| MRTN13WT.SBM.85apr06 | 2.80MB | SIO merge Sea Beam |
| MRTN13WT.SBM.85apr09 | 2.37MB | SIO merge Sea Beam |
| MRTN13WT.SBM.85apr12 | 2.55MB | SIO merge Sea Beam |
| MRTN13WT.SBM.85apr16 | 2.95MB | SIO merge Sea Beam |
| MRTN13WT.SBM.85apr19 | 2.85MB | SIO merge Sea Beam |
| MRTN13WT.SBM.85apr23 | 2.80MB | SIO merge Sea Beam |
| MRTN13WT.SBM.85apr27 | 3.38MB | SIO merge Sea Beam |
| MRTN13WT.SBM.85may01 | 3.09MB | SIO merge Sea Beam |

| Files | File Size | Description |
|---|---|---|
| MRTN13WT_Multibeam.xml | NCEI created ISO metadata |

| Files | File Size | Description |
|---|---|---|
| support.tar.gz | 1.21MB | Supporting data |
| svp.tar.gz | 50.5KB | Sound Speed Profiles (SSP or SVP) |