You need to be quick and proficient at elementary mental arithmetic - adding, subtracting, multiplying, dividing - without a calculator - quickly and accurately.
You need to be able to re-arrange elementary algebra - ie, "make 'x' the subject of the following equation" when it is set out as 'y' = something.
And you need to understand sine, cosine, and tangent.
It really doesn't need to be any deeper than that. No calculus. No hyperbolic functions.
Paul
[ 14 January 2002: Message edited by: Paul Hickley, Gen Nav Spec, Oxford ]</p>