Problem

"reflector-point"-marker

two markers, one just above the guy and the other in about 20m distance..

Each station-point is marked with a small dot of nail-varnish (from your wife or girl friend ;-) - red normally, other colours if your survey helpers are colour-blind <- no joke!)

Additionally each "important" station gets a "reflector-point" sticked together with a small peace of synthosil-paper (same we use for the sketches). The reflector makes it easy to find the point later even in very big and dark galleries, on the synthosil you can easily write station numbers etc. with the pencil you have anyway with you.

The varnish dot marks the exact station-point - the reflector is placed (sticked with some mud for example or in a small rock fissure) nearby somewhere where it can be seen from the gallery.

Advantages of this:

• you or your successors will find old station points very fast
• you can even take your bearings on the written numbers
• quite discrete, aesthetical solution that is also removeable
• works still after 10 years and more
• very smart for loop-junctions that are to narrow to pass, chimnies, pits!

Known Disadvantages:

• not applicable in flooded + streaming passages of course (but in slowly flooded aereas - yes!)

The material:

The reflecting material is exactly the same that you see on every street - it's used for the street-signs. If you find a manufacturer of such signs nearby you will be able to get vaste-material for free - otherwhise it can be found e.g. in hobby-markets or bike-shops.

good survey!