DATUM CENTRE & CENTRE CENTRE

DATUM

click left button on a point to use as a datum reference point to measuring from
This function toggles on/off, watch the cursor position box which will give the cursor distance from the datum point

CENTRE
find the centre of two points by clicking left button on both end points

HINT Make sure you are in the tool you want to use from the centre point ( both centre and centre/centre work inside other tools - there is no point in finding the centre if you have then, to move the cursor to select the tool you need) -very useful for placing windows central in a wall.

CENTRE CENTRE
find the centre of a rectangle by clicking the left button on 3 points clockwise

HINT
Useful for placing text