How to Say "magnetic compass" in Spanish
The Spanish word for “magnetic compass” is “brújula” — A2 level.

Examples
Necesitamos una brújula para caminar por la montaña.
We need a compass to hike through the mountain.
La aguja de la brújula siempre señala hacia el norte.
The compass needle always points toward the north.
Antes del GPS, los marineros dependían totalmente de la brújula.
Before GPS, sailors relied entirely on the compass.
Gender Consistency
This is a feminine noun. Even though it's a technical tool, you must always use feminine articles: 'la brújula' or 'una brújula'.
Using 'Con'
When talking about using the tool to navigate, we almost always use the word 'con' (with), just like in English: 'Navegar con brújula'.
The 'Bruja' Trap
Mistake: “Using 'bruja' when you mean 'brújula'.”
Correction: Say 'brújula' for the tool. 'Bruja' means 'witch'. They sound similar but are very different!
Related Translations
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