NOAA Considers Abandoning Printed Annual Tide and Current Table Prediction Publications

A recent decision by the U.S. Coast Guard Policy Office is allowing the use of electronic tide and tidal current predictions to meet carriage requirements (33 CFR 164.33 and 46 CFR 28.225) for vessels operating in U.S. waters. Although printed publications are still preferred, electronic products such as PDF files or online predictions generated and stored for use are being accepted. CO-OPS is investigating the possibility for the elimination of the annual Tide Tables and Tidal Current Tables publications as printed versions. In light of this change in policy and with the availability of tide and tidal current predictions for... (read more)
2017-11-01 09:02:04

Valeport Introduce TideMaster

Valeport are pleased to introduce the TideMaster as the latest tide gauge in their wide range of tide measuring options. Designed to replace the ever popular Model 740, the TideMaster incorporates many enhancements. An IP67 rated injection moulded housing incorporates the electronics and a display option with a quick access battery location for the 4 x C cell batteries required. Inputs for pressure-based tidal measurement and a Gill Windsonic for primary Met data offer a simple and cost-effective instrument.   Pre-programmed sampling regimes for standard tide measurement feature along with a 512 Mbyte SD memory card and Bluetooth wireless communication.... (read more)
2009-10-23 12:42:25

Tides and currents are giving hydrography an extra (some say challenging) aspect, which has to be accounted for. If you are measuring ‘absolute’ water depths, as do surveyors for nautical charting or those involved in dredging or wreck clearing, you have to determine a vertical reference level to reference the measured depths. The height of the tide above this reference at the time of the measurements needs to be determined. Close to shore this can be done using existing tide gauges or erecting extra ones yourselves. Farther offshore one way of solving how to collect the necessary tidal data is... (read more)
2008-01-01 01:00:00

Near-shore Automatic Identification Systems

Part 2: Current and Potential Applications of AIS
Last month we gave an introduction to automatic identification systems, developed to allow ships and coastal stations to accurately locate and identify each other. Here we describe the current and potential applications of the technology as applied to marine civil engineering, ranging from the use in a wave energy project and oil spill applications to the use in ports and harbours. Of particular interest is the provision of binary messages such as the type 8 TideMet message with an embedded weather and tidal data payload (see Figure 1). The real-time tide and meteorological data are of direct use in a... (read more)
2010-02-11 04:13:32

Monitoring Dover Tides and Weather

A tide and weather monitoring system which will further enhance the efficiency of shipping movements into the Port of Dover, UK - one of the world's busiest harbours - has been provided by Seatronics Ltd, UK. The new system has UHF telemetry link integrating it with Dover Harbour's LAN to ensure that up-to-date tide and weather information is available throughout the harbour. The applications are many. Valeport Ltd, UK, worked with Seatronics and the Marine Operations and IT Departments of Dover Harbour Board to design, manufacture and install the tide and weather monitoring system. (read more)
2003-10-23 12:00:00

New Environmental Monitoring Systems at Two Key Ghana Ports

OceanWise has recently been involved in a project with Ghana Ports and Harbours Authority (GPHA) – dubbed ´the trade and logistics hub of Western Africa´. The project involved installing a comprehensive environmental monitoring system at two key GPHA ports: Tema and Takoradi. The tide and weather system is designed to deliver essential real-time tide and weather data to the GPHA operators, hydrographers and pilots who will rely on the data to make important operational decisions and ensure safety at the port. The data from the tide and weather stations is collected, managed and published in the OceanWise data publishing platform... (read more)
2020-03-02 09:58:25

Dinkum Sands - in Search of an Island in the Far North

In June 1979, the Bureau of Land Management's Outer-Continental Shelf Department proposed to the state of Alaska's Department of Natural Resources that a feature in the Beaufort Sea, known as Dinkum Sands, be eliminated as a salient point determining the 3-mile offshore limit, separating federal and state offshore leasing. Dinkum Sands lies between Narwhal and Cross Islands, four to five miles from each, approximately eight nautical miles from the mainland. The 3-mile limit is a theoretical line marking the territorial sea boundary. All waters within this 3-mile area are considered under state jurisdiction for oil exploration, while outside the limit,... (read more)
2008-01-01 01:00:00

Developments in Specifications for Survey Datums

The requirements for hydrographic surveys influence the specifications adopted. Requirements, however, are not static. For example, emerging requirements now include collecting hydrographic data for the potential impacts of tsunami modelling, inundation mapping and climate change (TMIMaCC). These relatively new requirements are resulting in modified specifications. One such change is the requirement to provide data relative to multiple height datums.<P> Traditionally, the vertical datum of hydrographic survey data was directly related to the tide. Depending on whether the nature of the tide was predominantly diurnal or semi-diurnal, surveys referred to mean lower low water (MLLW) or mean low water spring (MLWS)... (read more)
2009-01-05 12:00:00

Simplified Tidal Datum Calculation from Water Level Measurements

JOA Surveys, LLC (JOA) has developed a free, online service called TideLab that will automatically compute United States tidal datums from raw water level measurements. The online tool is built to be flexible, simple, powerful and accurate. Up to now, datum computations in the United States were time-consuming, required manual intervention, and were generally only available to tidal analysts with years of experience. TideLab allows users to unlock additional value from their water level data by quickly and simply computing tidal datums with minimal user input The TideLab algorithm is accessible through the TidalDatumTool website. Data submitted through the website... (read more)
2017-05-12 11:17:15

Valeport Presents Latest Sensor and Software Updates

Valeport, a leader in oceanographic, hydrographic and hydrometric instrumentation, used Oceanology International in London to launch a number of developments across its range including new probes, visualisation software and a portable tide station. Launched at Oi18, the new unique probe, SWiFTplus, combines the power of the SWiFT SVP and a turbidity sensor. SWiFTplus uses Valeport’s world-leading high-accuracy sensor technology and incorporates turbidity observations with sound speed, temperature and pressure sensor technology coupled with the convenience of Bluetooth connectivity and rechargeable batteries. Using the new Valeport Connect app, data can be quickly downloaded and reviewed wirelessly via Bluetooth, and instantly shared... (read more)
2018-03-27 09:23:51
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