## Blog Post

### Rhumb Line

* The Rhumb Line*: A conventional line on the Earth’s surface that intersects all geographic meridians at the same angle. It has the shape of a spiral that approaches the poles without going through them. (mai mult…)

### Nautical Charts. Types of Scales.

* The Nautical Charts* showing the Earth’s surface or a portion thereof on a plan, in a certain proportion (scale) and with deformations subject to mathematical laws. (mai mult…)

### Echo Sounder. The correction of depth.

* Echo Sounder*: It is an electric device used to determine the water depths by measuring the time interval for sound waves to go to the sea bottom and back again. It is also called Depth Finder or Acoustic Depth Finder. (mai mult…)

### Estimated Time of Arrival. ETA

* ETA*: Conventional abbreviation for ‘Estimated time of arrival’ or ‘Expected time of arrival’. The estimated time of arrival or ETA is a measure of when a vessel is expected to arrive at a certain place. (mai mult…)

### The relationship between distance, speed and time.

The relationship between distance, speed and time is based on the well-known formula:

Distance = Speed * Time (mai mult…)