Side Scan sonar image of sunken barge.

Side Scan sonar image of shipwreck of the windjammer B. F. PACKARD. Surveyed by the NOAA Ship RUDE.

Multi-beam sonar image of ship wreck.

Multi-beam sonar image of ship wreck.

Multi-beam sonar image of ship wreck. Note also large sandwaves indicating high current regime.

Side scan sonar image of USS MONITOR.

Side scan sonar image of USS MONITOR.

Side scan sonar image of debris field of ship wreck.

Multi-beam sonar image of entrance to Portsmouth Harbor, New Hampshire.

Side scan sonar image of unknown steamer surveyed by NOAA Ship RUDE. Same as image cgs00862.

Side Scan sonar image of wreck of oil barge leaking viscous material on sea floor. White area is leaked material having significantl different reflective properties as compared to natural sediment in area.

Side Scan sonar image of ship wreck of S-5 submarine which foundered in 1920. White area is bottom of hull while black area is shadow of superstructure. Surveyed by NOAA Ship WHITING in 2001.

Side Scan sonar image of ship wreck of S-5 submarine which foundered in 1920. White area is bottom of hull while black area is shadow of superstructure. Surveyed by NOAA Ship WHITING in 2001.

Side Scan sonar image of ship wreck of S-5 submarine which foundered in 1920. White area is bottom of hull while black area is shadow of superstructure. Surveyed by NOAA Ship WHITING in 2001. Blocky reflections are debris field associated with wreckage.

Comparison of older Side Scan and multi-beam systems on ship wreck. The newer higher-resolution systems are to the right of the image in both instances.

Multi-beam sonar image of ship wreck.

Side Scan sonar image of humpback whale on seafloor off New England.

Single beam echo sounding analog record of ship wreck.

Sandwaves imaged by a multi-beam sonar sounding system. The saw-tooth line in the bottom of the image is superimposed on this 3-D image to emphasize the wave structure of the sediments in this area.

Multi-beam sonar image of seafloor along the central Alaska coast. This image was generated from date obtained by the NOAA Ship RAINIER and shows rocky bottom in the vicinity of nearshore islands (white patches in bottom of image).

A Coast and Geodetic Survey benchmark used to determine elevations.

A National Ocean Service benchmark used to determine elevations. The designation National Ocean Service indicates this bench mark was set after the Coast and Geodetic Survey was absorbed into NOAA.

A NOAA surveyor is leveling from a tidal staff (top of staff visible to left of observer's right leg). Bench marks such as the one displayed in the previous image are set and leveled to from the bench mark to help assure the staff has has not moved vertically during the course of a series of tidal observations and that an accurate tidal datum has been established in the area.

Setting up tide gauge equipment somewhere in Alaska. Must have been a rainy day .

Processing hydrographic data on board the NOAA Ship RAINIER.

Coxswain of launch off NOAA Ship RAINIER keeping the boat on line while operating in SE Alaska.

Monitoring both side scan and multi-beam data acquisition systems while doing launch hydrography off the NOAA Ship RAINIER.

Coast and Geodetic Survey office building.

Autographic sounding machine record from the U.S. Lake Survey. In: "An Autographic Sounding Machine" by M. Meigs, 1922. The Military Engineer, Volume XIV, No. 76, p. 199-201.

Autographic sounding machine apparatus mounted on U.S. Lake Survey catamaran. In: "An Autographic Sounding Machine" by M. Meigs, 1922. The Military Engineer, Volume XIV, No. 76, p. 199-201.

Preparing survey boat for launching.

Engineer Casey Green monitoring fueling operations at Dutch Harbor. C&GS Ship PATHFINDER.

Engineer Casey Green monitoring fueling operations at Dutch Harbor. C&GS Ship PATHFINDER.

Launch approaching ship for pickup.

Third Assistant Engineer Tom Garten on left talking to "Spud", an oiler on the PATHFINDER.

Eating shrimp in the engine room in front of the Bailey Board.

Laurel Savage on left and Third Assistant Engineer Tom Garten on right eating shrimp caught off pier at Adak.

Young PATHFINDER swabbie striking a jaunty pose.

PATHFINDER's cook seeing if he can catch dinner.

PATHFINDER's cook with dinner for at least a few crew members.

HMMM!!! This doesn't look to safe by today's standards. Hope that guy can swim.

A beautiful mountain peak somewhere in the Aleutians.

A nameless waterfall somewhere in the Aleutian Islands.

Survey launch approaching the PATHFINDER for pickup.

A survey launch off the PATHFINDER.

A large octopus getting ready for the cookpot on the PATHFINDER.

Stationary from the Coast and Geodetic Survey Ship PATHFINDER.

Ship image as found on stationary from the Coast and Geodetic Survey Ship PATHFINDER.

Envelope bearing news from the C&GS Ship PATHFINDER as written from St. Paul Island in the Bering Sea.

Granite obelisk used to designate one of the end points of the baseline measured by Alexander Dallas Bache on Dauphin Island in 1847. This granite marker is now in Ft. Gaines at the entrance to Mobile Bay. Although moved from its original location, it is the oldest known Coast Survey marker on the Gulf Coast.