
die Seefahrt
seafaring
Travel by ships on the sea as a whole field, including navigation, trade, and transport.
Die Erfindung des Kompasses revolutionierte die Seefahrt.
The invention of the compass revolutionized seafaring.
seafaring / sea voyage
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seafaring
Travel by ships on the sea as a whole field, including navigation, trade, and transport.
Die Erfindung des Kompasses revolutionierte die Seefahrt.
The invention of the compass revolutionized seafaring.

sea voyage
A single, concrete journey or trip across the sea.
Nach einer langen und stürmischen Seefahrt erreichten sie endlich Land.
After a long and stormy sea voyage, they finally reached land.
The word is made up of 'See' (sea) and 'Fahrt' (journey/trip). So it literally describes a journey on the sea.
Die moderne Seefahrt ist ohne Satellitennavigation kaum denkbar.
Modern seafaring is hardly imaginable without satellite navigation.
An important fixed expression is 'zur See fahren' (to go to sea). It means to work as a sailor or to begin a career in shipping/seafaring.
Schon als junger Mann wollte er zur See fahren.
Even as a young man, he wanted to go to sea.
When a single journey is meant, 'Seefahrt' (sea voyage) is often used with an indefinite article ('eine') and an adjective. The general meaning, by contrast, often appears without an article or with the definite article in general statements.
Es war eine lange und gefährliche Seefahrt.
It was a long and dangerous sea voyage.
When a concrete journey is meant, the verb 'unternehmen' (to undertake) or 'machen' (to make/do) is often used. Typical adjectives are 'lang' (long), 'kurz' (short), 'stürmisch' (stormy), or 'ruhig' (calm).
Nächstes Jahr wollen wir eine Seefahrt durch die Karibik unternehmen.
Next year we want to take a sea voyage through the Caribbean.
shipping / boat trip
Schifffahrt and Seefahrt both refer to transportation or travel by ship. Schifffahrt is the more general term and also includes inland waterways and the economic sector, while Seefahrt specifically relates to the sea. Use Schifffahrt for general shipping and Seefahrt for maritime contexts.

Die Seefahrt über das Meer dauerte wegen des starken Windes mehrere Tage.
The sea voyage took several days because of the strong wind.
Die Schifffahrt auf dem Fluss transportiert täglich viele Personen und Güter.
Shipping on the river transports many people and goods every day.