How does GPS work?

Of course, as a Nautical Specialist, I also deal with the international discussion on the advantages and disadvantages of satellite-based navigation, e-navigation and conventional terrestrial and astronomical navigation.

In my announced sequel, the second part of GPS, it is primarily about the technical and physical operational and functional limitations to which GPS is subject. These limitations, in part, have serious implications for the accuracy of GPS, and even go as far as limiting the functionality of GPS in its functions or even making it impossible. In doing so,

The vulnerability of GNSS in shore-based use is definitely different and to be regarded as much more risky than on the high seas.

Found on YouTube:

Tom Mellor - C​hairman of the IHO Electronic Navigational Chart Working Group (ENC WG) and Head of Digital Standards at the UKHO - explains what the IHO's ECDIS and ENC Standards mean.

What is causing the forward motion of a stopped vessel using continous bow thruster action?
by Capt. H. Cauvier

Manoeuvring large ships at close quarters and on shallow water is one of the most difficult aspects of shiphandling because of the complex hydraulic interactions depending on the ships' speeds, on the water depth and on lateral restrictions like in canals. Training is conducted both on meeting and on overtaking ships in shallow waters. This video shows how overtaking in a canal should be conducted: come in close to the stern and then move away from the bow that will be sucked towards your...

With the increasing accuracy and reliability of navigational receivers, this part of the video module will try to establish a better understanding of the mathematical definition of the Earth’s surface and mapping of this curved shape onto a plane surface. Chart Projections and Chart Accuracy https://youtu.be/kOaWimnAN-U Principle Used For Creating Electronic Charts https://youtu.be/xY_MBubhUFs Display of Electronic Charts https://youtu.be/qnoFO0T-cLo Route Planning With ECDIS https://...

Blog: https://www.merrimacins.com/understanding-and-preventing-tug-barge-risks/ Understanding and Preventing Tug & Barge Risks The maritime industry relies on tugboats and barges for a wide range of applications. Tugs are used to pilot vessels into and out of ports, while barges are used to transport bulk materials. The relationship between tugs and barges is critical, as most barges are not self-propelled and must rely on the skilled operation of a tug or tugs for propulsion. At Merrimac...

Like many seafarers I have long been a keen follower of The Nautical Institute’s MARS programme, and along with many other members I listened to the recent webinar on that topic. One theme which was repeated more than once was that it is better to learn from someone else’s misfortune rather than have it happen to you. Having personally been involved in two near misses resulting from unsafe pilot transfer arrangements in a relatively short space of time, I asked how experiences and knowledge specifically about pilot ladder safety could best be promulgated to avoid repeating common accidents or near misses.

Details on Fremantle Incident: MV Maersk Sheoku Collides with STS Leeuwin II and actions of Crew and Pilots April 21, 2025 In this episode, Sal Mercogliano — a maritime historian at Campbell University (@campbelledu) and former merchant mariner — discusses the Australian Transport Safety Bureau Interim Report on the Collision between Maersk Shekou and tall ship STS Leeuwin II. #leeuwinII #Fremantle #collision 00:00 Background 09:57 Arrival at Fremantle 17:22 Entrance into Channel 27:27...