Division (b) Aeroplanes operating under VMC at night shall be, in addition to (a), equipped with:F1

a means of measuring and displaying the following:

1. (i)

   turn and slip,

2. (ii)

   attitude,

3. (iii)

   vertical speed, and

4. (iv)

   stabilised heading;

a means of indicating when the supply of power to the gyroscopic instruments is not adequate.