The Breitling Watch Source Forums

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That's the Tachymeter scale.
It shows you the speed you are moving (in km/h) when you measure the time needed for traveling a 1 km.

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Pretty sure Base is related to base leg on an airfield joining configuration, base falls in between turning from downwind into final. can't think how the calculations would help at all though, as there's not a lot of time to be looking at the dial at this stage of the flight. If anyone knows I would love to know myself. (base isn't even on the CRP-1) which is what the Navi was based on.

theres no way this is for base leg in a circuit. It is more likely for working out navigation legs etc. I refer you back to bnewbie's comment, though i'm hesitant to correct bnewbie, I always thought it was measures in knots.

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Men are from Mars, women are from Hell.

Base 1000 is the name of the tachymeter scale.

As bnewbie says tachymeter scales are designed to calculate speed and a base 1000m or base 1km scale is intended to calculate speeds based on travelling 1,000m. In watches that don't have an aviation history you sometimes see a base 200 tachymeter scale which are generally used for calculating slower speeds.

Is it really primarily for m/s? I genuinely thought it was primarily for knots and nautical miles, and km could be worked out using the scales. For example, it can be used to workout fuel consumption, but this is per nautical mile, not kilometer. Also rates of climb and descent, it can be calculated over what distance it will take to climb, and this again is in nm. The list goes on, but it is generally I thought it was in knots or nm.

Although, considering the company i'm questioning, maybe I should pipe down! but every now and again I use my navi for work, i'd like to think i haven't been completely wrong!

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Men are from Mars, women are from Hell.

Well a tachymeter can of course be used to calculate any speed that you want. However if you look at the dial it doesn't actually say base 1,000, it says base 1,000m. Further the 1,000m isn't just positioned for aesthetics - it lines up with 3.6 seconds - which is what you would expect of course.

Just to be truly anal......

You can also use the tachymeter to calculate production rates.



When it comes to nautical or statutory miles, they are marked on the outer of the two inner rings (if that makes sense).

Thanks for clearing it up for me Roff.

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Men are from Mars, women are from Hell.