You face any number of challenges in marine construction. Tidal height variations, currents, distance from land and a work area that you can't always see. Your ability to position a structure, vessel or dredge head can be compromised by everything from water depth to working at night or in foggy conditions. Whether its port construction or offshore oil a Trimble system can provide you with the tools to position you for success.

Trimble offers a range of high-precision centimeter level (RTK) positioning as well as sub-meter (DGPS) positioning solutions which can be integrated with other marine sensors, the HYDROpro™ Construction and the Terramodel® HDMS to create application specific marine systems.

RTK - The RTK Advantage provides centimeter horizontal and vertical positioning accuracies. Using RTK requires a source of satellite corrections such as an RTK base station. A Trimble RTK system can replace a radio tide gauge for real-time tide and heave measurement, and a survey grade Gyro compass for precision heading. Trimble RTK positioning sensors include:

Location RTK - Marine applications such as dredging require a precise vertical measurement for accurate volumes but don't need the same precision for the position. The SPS651 and SPS461 Modular receivers have this Precise Vertical capability offering RTK affordability for marine applications.

Trimble RTK positioning sensors include:

• The Trimble® SPS461 Modular GPS Heading Receiver
• The Trimble® SPS551 Modular GPS Receiver
• The Trimble® SPS551H Add On Heading Receiver
• The Trimble® SPS651 Modular GPS Receiver
• The Trimble® SPS751 and SPS851 Modular GPS Receivers

In addition to using RTK GPS for high accuracy marine construction applications, Trimble also offers the Trimble SPS730 and SPS930 Universal Total Stations. These total stations provide advantages over GPS solutions in some applications. These include near shore or inland waterways where short-range positioning applications in areas where 3D centimeter level real-time positions are required and GPS signals are difficult to receive. Examples include rivers and canals, near tree canopy, in canal tunnels, and near or under large structures such as bridges, harbor walls, or ships.

• DGPS - Provides sub-meter horizontal position accuracies. DGPS requires a source of satellite corrections such as IALA Beacon, EGNOS, WAAS, proprietary SBAS or DGPS base station transmissions. A Trimble DGPS receiver can be combined with a dredge head depth sensor and radio tide gauge for dredging systems. Sub meter positioning sensors from Trimble include:
  • The Trimble® SPS361 DGPS/Beacon Heading Receiver
  • The Trimble® SPS351 DGPS/Beacon Receiver
  • The Trimble® SPS551 Modular GPS Receiver
  • The Trimble® SPS551H Add On GPS Receiver

Trimble marine construction solutions address the following applications:

Structure placement

Positioning caissons, bridge sections or other pre-fabricated structures to today's tolerances in waterways or offshore can be a difficult task. Your ability to accurately position the structure can be compromised by water currents or having to work at night to allow for tides. The need for real time guidance with centimeter accuracy and to a predefined heading can be met with a Trimble RTK system. Real time guidance displays help to reduce operator error that might otherwise compromise the integrity of the structure.

Learn how others are using structure placement solutions from Trimble:

• Rock dumping
• Monaco port
• Big Dig

Dredging

No matter what your dredging project, avoid the costly mistake of over or under dredging - thanks to Trimble dredging solutions. Highly accurate dredging can be difficult, because seabeds and riverbeds are obscured from view. Trimble solves your problem with accurate remote positioning you can trust.

Integrate your entire onboard navigation system with Trimble. You get a 3D position of the dredge head, which is then displayed with the channel design. So you can see exactly how much earth you're moving even under water. Dredge with confidence using Trimble dredging solutions.

Learn how others are using dredging solutions from Trimble:

• Florida Dredge & Dock
• Port of Sines
• Environmental Dredging

Piling & Jetty construction

Driving piles into a riverbed or seabed requires great accuracy in a harsh environment. Trimble utilizes RTK GPS, heading sensors and specialized integrated software to create positioning solutions-designed specifically for marine construction.

Learn how others are using piling and jetty construction solutions from Trimble:

• Bath iron works

Rig positioning

Towing and positioning drilling and production rigs in a marine environment is extremely difficult. Your ability to position the structure can be compromised by everything from sea conditions to working at night or in the fog. The need for sub meter accuracy and precise heading alignment in this often harsh offshore environment provides a further challenge.

A major part of the rig move process is the communication with anchor handling vessels to ensure that anchors are moved and laid correctly. Trimble simplifies these complex processes, creating solutions that offer accurate positioning and present data in easy to interpret displays.

Learn how others are using rig positioning solutions from Trimble:

• Trident offshore oil rig positioning