I haven’t bothered with lines on my table, ‘cos I’ve always found that if it’s critical I always find myself with a protractor in hand anyway, and if it’s not it, then it doesn’t matter!
In any case the angles I mostly use are between 1 or 2 degrees for relief, 5 or 10 for clearance and then the half angles for threading tools, plus a smattering of odd things for form tools.
For the common sharpening of lathe tools etc., I have little ‘angle-gauges’ cut out of flat stock which will either stand up on their edge and can be ‘eyed in’ against the belt-face, or laid flat against the edge of the table / belt / guide.