Generally, I'm more used to methods described here for the US.
Our task this past weekend was to use dots to remark a trail, but the method of placement was opposite to what I'm used to: the dots were placed inward toward the path - only one dot.
I questioned the wisdom of such placement, but the ranger was adamant: one dot placed facing the trail in a perpendicular fashion. He affixed the first marker to be sure his point was made.
So he seemed to be following advice more or less offered here.
Is there ever a good reason to place markers facing the trail, rather than facing the direction of walk?
What about height and distance - how far apart should blazes be posted?