No you can't use tape or obviously any thing permanant such as a marker, the rule states no substances, and the glue on the tape rates as such.
BUT, you can place any thing you wish to use which is just "placed" in your shooting area. I use folding rulers with the rifle shooter we work with but I also know there are pistol shooters doing the same thing. It is perfectly legal, you will see them used at all levels of match.
Before you set up, stand back as far behind the point as you can get and judge as accurately as you can the direct line at right angle from the target (its not always the centre of the point). Then set up your position accurately from that centre line. Make a note in your shooting diary of the position and then you can always repeat it where ever you shoot.
Good shooting
Robin
Walther KK500 Alutec expert special - Barnard .223 "wilde" in a Walther KK500 Alutec stock, mmm...tasty!! - Keppeler 6 mmBR with Walther grip and wood! I may be a Walther-phile?