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Why do CAT2 charts have a DA/DH with a RA, but CAT1 approaches just have a DA/DH without RA?

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Why do CAT2 charts have a DA/DH with a RA, but CAT1 approaches just have a DA/DH without RA?

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  1. RA or radar altitude/altimeter is not required for a CAT 1 approach since it will be to higher minimums (usually 200ft DH).

    The extra precision required to go to 100ft for a CAT 2 approach requires the use of a radar altimeter (and precise measurement of the ground level below the glide slope at DH).

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