In late May, NOAA Ship Rainier officially started her Chatham Strait hydrographic survey project in southeast Alaska. It’s often difficult to imagine the age of many of the depth measurements depicted on Alaskan charts, but this short animation brings it home.
The older picture is U.S. Coast and Geodetic Survey Steamer Patterson and her steam-powered launch Cosmos, surveying Gut Bay in 1897. (The USC&GS is one of NOAA’s predecessor agencies, and a direct predecessor of the Office of Coast Survey.) We juxtaposed Patterson with the Rainier, who is finally able to update the bathymetry — at the exact same location — 116 years later.
The Patterson was under the command of Lt. Cmdr. E.K. Moore, U.S. Navy, while Coast Survey assistants carried out the scientific work. In today’s Coast Survey, a NOAA officer — on the Rainier, it is Cmdr. Richard Brennan — is both commander of the vessel and its chief scientific officer.
The opening to Gut Bay is only about 100 yards wide – and it seems narrower!
“It must have been a real challenge to get the Patterson into this tiny bay in 1897,” Cmdr. Brennan observed. “The opening to the bay is only about 100 yards wide — and seems narrower than that when you are in the middle of it, since the cliffs rise almost vertically on either side.”
“We had the benefit of surveying the very narrow entrance’s seafloor with complete multibeam sonar coverage, and had the use of radar and GPS to inform us about our exact location as we made our way through the incredibly tiny opening into this bay. The Patterson (a steam powered sailing vessel) would have had to do this visually with only a few lead line soundings across the entrance. This must have made for an exciting navigational experience!”
Credit for photo of Rainier: Ensign Damian Manda
Public is invited to try beta version of MyNOAACharts
As recreational boaters gear up for a summer of fun on coastal waters and the Great Lakes, NOAA is testing MyNOAACharts, a new mobile application that allows users to download NOAA nautical charts and editions of the U.S. Coast Pilot. The app, which is only designed for Android tablets for the testing period, was just released.
MyNOAAChart, which can be used on land and on the water, lets users find their positions on a NOAA nautical chart. They can zoom in any specific location with a touch of the finger, or zoom out for the big picture to plan their day of sailing. The Coast Pilot has geo-tagged some of the major references and provides links to appropriate federal regulations.
MyNOAACharts, a mobile app beta test for Android tablets, can easily integrate the user’s location, the nautical chart, and all the navigational information from the U.S. Coast Pilot.
Easy and workable access to nautical charts is important for boating safety, says Rear Admiral Gerd Glang, director of NOAA Office of Coast Survey. He recalls a funny, but poignant, reference to charts.
“A popular t-shirt has a ‘definition’ of a nautical chart splayed across the front: ‘chärt, n: a nautical map that shows you what you just hit,’” Glang explains. “As creative as that is, a boating accident can kill. Keeping a nautical chart on hand – before you hit something – can save lives.”
The beta test for MyNOAACharts will end on Labor Day, September 2, 2013. Coast Survey will then evaluate usage and user feedback, which will be pivotal in any decision to move forward.
“Expanding the app across a multitude of platforms, ensuring easy accessibility to over a thousand charts and nearly 5,000 pages of U.S. Coast Pilot, will take considerable resources,” Glang notes. “We truly want users to let us know if the app meets their needs.”
Boaters who don’t have an Android tablet shouldn’t despair. The Office of Coast Survey provides free BookletCharts, which are 8 ½” x 11” PDF versions of NOAA nautical charts that can be downloaded and printed at home. The U.S. Coast Pilot is also available in a free PDF version.
Important notice for commercial mariners: The mobile app MyNOAACharts and the BookletCharts do not fulfill chart carriage requirements for regulated commercial vessels under Titles 33 and 46 of the Code of Federal Regulations.
NOAA Office of Coast Survey has released a new nautical chart for the Arctic, which will help mariners navigate the Bering Strait. Chart 16190 (Bering Strait North) incorporates precise depth measurements acquired recently by NOAA Ship Fairweather hydrographic surveys.
Coast Survey has also released a new edition of Chart 16220 (St Lawrence Island to Bering Strait).
“Our Arctic Nautical Charting Plan identified the need for 14 new charts in the Arctic,” explains Commander Shep Smith, chief of Coast Survey’s Marine Chart Division. “Chart 16190 was high on our list of priorities, since the Bering Strait is the maritime gateway from the Bering Sea in the Pacific Ocean to the Chukchi Sea in the Arctic Ocean.”
“Charting the gateway is absolutely vital for safe navigation, but it is more than that,” Smith says. “In addition to the very practical aspects, this chart also symbolizes an opening to the growing opportunities for maritime transportation in the Arctic.”
Charts 16190 and 16220 include recent hydrographic information in U.S. waters between Cape Prince of Wales and the immediate waters surrounding Little Diomede Island. They also include recent NOAA shoreline surveys of the Diomede Islands and Cape Prince of Wales.
NOAA Chart 16190, Bering Strait North
Chart 16190 provides 1:100,000 scale coverage, including a 1:40,000 scale inset of Little Diomede Island. Chart 16220 provides 1:315,350 scale coverage. Prior to these charts, the best available information was from Chart 16005, at a scale of 1:700,000. At that scale, every charted depth was separated by about two nautical miles and the chart depicted only a handful of depths. Most of the old charted depths were from 1950 and provided incomplete information about the depths or possible hazards on the sea floor.
Chart 16190 is the second new chart resulting from the Arctic Nautical Charting Plan. Coast Survey created the first of the new Arctic charts, Chart 16161 (Kotzebue and Approaches), in April 2012. (See New Alaska navigational chart makes increased Arctic shipping safer.) Chart 16220 had previously been maintained by the National Geospatial-Intelligence Agency, but Coast Survey assumed responsibility for it in 2010.
The equivalent NOAA electronic navigational charts (NOAA ENC®) for 16190 will be available this summer. Watch for US4AK8D (Bering Strait North), and US5AK8D (Little Diomede Island). The 16220 ENC equivalent — US3AK89M — was created in 2012 and included the new Fairweather hydro.
Coast Survey’s Marine Chart Division is responsible for updating the nation’s 1,023 nautical charts. Chart 16190 was compiled by Kieumy Dinh and reviewed by Eric Wallner, under the management of Andew Kampia. Chart 16220 was updated by Pravin Shrestha (compiler) and Yan Xu (reviewer).