Comments by "Rob Fraser" (@krashd) on "In-Car Sat Nav? Without a Satellite? In 1971? | Tomorrow's World | Retro Tech | BBC Archive" video.

  1. The cassette only has phrases recorded on it so the same cassette can be used anywhere in the world. The directions come from the unit below the dashboard.
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  2. The tape does not store the directions, it only has the audio recorded on it - the same audio that you could use anywhere in the world since "turn left in 50 yards" and "turn right at the next junction" can be used anywhere. The directions are stored in the device under the dashboard.
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  3. No, you would only ever need the one tape as it only contains the phrases. The directions are saved into the map device under the dashboard and you update it by programming in your journey before you leave - 200 yards, left, 40 yards, right, etc. A bit like programming a video.
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  4. Yes, along with metres thanks to our imperial/metric hybrid way of life.
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  5. No, one only needs a single cassette tape unless one requires phrases like "turn left" and "in 50 yards" to be recorded in a million different accents and languages. Most of us would just use the same tape with the clear English phrases on it.
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  6. Except you would only need a single cassette unless you wanted to fill 5 trucks with different languages and accents...
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  7. One cassette is plenty, after all the cassette only has the phrases recorded on it and you only need so many phrases when giving directions.
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  8. London City (formerly just London) is the name of an airport, it's the small one directly in the centre of the city on an island.
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  9. And yet tens of millions of cars have sat navs today.
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  10.  @paulxaphier5488  Clean? You need your eyes fixed.
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