Leveling to tide gauge.

Canadian Hydrographic Service launch checking NOAA tide gauge during international cooperative charting project on Passamaquoddy Bay. The range of tide is approximately 25-feet on Passamaquoddy Bay.

Canadian Hydrographic Service launch checking NOAA tide gauge during international cooperative charting project on Passamaquoddy Bay. The range of tide is approximately 25-feet on Passamaquoddy Bay.

Checking tide gauge on dolphin in Passamaquoddy Bay area at low tide. Automatic tide gage is mounted on long stilling well. Stilling well is exceptionally long because the range of tide is approximately 25-feet on Passamaquoddy Bay.

Canadian Hydrographic Service launch in picturesque cove on Passamaquoddy Bay.

Canadian Hydrographic Service launch at dolphin tending tide gauge. Note tide staff.

Canadian Hydrographic Service launch at dolphin tending tide gauge at high tide.

Mirrors for electronic distance measurement and light target for triangulation angle measurement. Equipment set up over Station CHAMCOOK Reference Mark. View is looking southwest over St. Croix River into Maine.

Tide gauge with overlapping tide staffs because of high range of tide. The gauge is on the platform in the background and is a gas-bubbler pressure actuated type.

A closeup of the upper tide staff of the two overlapping staffs in the previous picture.

Anchoring the bubbler tide gauge gas hose to the seaweed covered rocks.

Tide flats at low tide on the east side of Cook Inlet.

Chief Survey Technician Earl Krick of the NOAA Ship FAIRWEATHER installing a tide gauge in upper Cook Inlet.

Digging a trench to bury and anchor gas bubbler tide gauge tubing.

Looking northeast from tide gauge location in Upper Cook Inlet. Large rock is a glacial erratic.

Deck hand off NOAA Ship FAIRWEATHER assisting in building of tide gauge station in Upper Cook Inlet.

Trying to find deep water for Zodiac rubber boat to return to NOAA Ship FAIRWEATHER after installing tide gauge in Upper Cook Inlet.

The view towards Cook Inlet showing the Zodiac at low tide. See image 4216.

The view from the Zodiac back towards the tide gauge installation and orange hydrographic signal in Upper Cook Inlet. The orange signal is to help position survey launches by use of three-point sextant fixes.

Lt. (j.g.) Robert Crowell operating Wild T-2 Theodolite at Port Etches on the east side of Prince William Sound.

Signal built at Gull Rock for triangulation observations at entrance to Port Etches on the east side of Prince William Sound.

Electronics rack on FAIRWEATHER hydrographic survey launch. Upper unit with orange numbers is recording Raydist navigational readings.

Hydroplot data acquisition system with controller on top paper tape reader and data punch middle lower unit, and PDP-8 computer with orange and yellow switches on bottom.

Survey technician annotating echo-sounder record on FAIRWEATHER hydrographic survey launch.

Interior of hydrographic survey launch off NOAA Ship FAIRWEATHER.

Motorola Mini-Ranger set up with Wild T-2 Theodolite for use in offshore range-azimuth hydrographic surveying.

Motorola Mini-Ranger set up with Wild T-2 Theodolite for use in offshore range-azimuth hydrographic surveying.

Installing tide gage staff.

Chief Survey Technician Earl Krick supporting 2X4 while hole being drilled to place mountings to support tide staff.

Double exposure of NOAA Ship FAIRWEATHER taken from same location at high and low tide at the pier at Anchorage. Tide range was between 30 and 35 feet.

Inshore survey boat running a line.

S/V Laidly returning to Fairport Harbor.

S/V Laidly in Fairport Harbor.

Interior of S/V Laidly.

Diver preparing to check source of shoal spot in sounding record.

Diver leaving S/V Laidly.

Inshore survey boat.

Inshore survey boat.

Del Norte navigation receiver aboard inshore survey boat.

Repairing transmission on inshore survey boat.

Del Norte navigation system shore positioning station.

Conducting range azimuth operations with the S/V LAIDLY. Transit surveying instrument operator reads angle to boat while Del Norte system determines range.

Range azimuth shore positioning station combining visual azimuth with transit electronic distance from Del Norte unit.

Visual station signal for use in calibrating S/V Laidly electronic navigation system with sextant.

Description not available.

Checking water level readings at Fairport Harbor Coast Guard Station.

Survey crew office trailers at Fairport Harbor Coast Guard Station.

Interior of office trailer at Fairport Harbor Coast Guard Station.

Fairport Harbor breakwater with Great Lakes ore carrier entering the harbor.

Real time plotter on S/V Laidly.