cave diving and the nss - bei Swiss-Cave-Diving

44 CAVE DIVING COMMUNICATIONS REELS AND LINE MARKERS 45
Plastic arrow and clothespin marking exit at "T"
Many divers prefer to add their own clothespin to an existing arrow
for added confirmation on the way out. Clothespins make excellent
visual aids and can withstand some banging around on the line.
For consistency, the NSS-CDS recommends that the clothespin
be placed on the OUTBOUND side of the arrow.
Plastic arrows identifying a
preferred exit at an intersection
It is possible that you will encounter an intersection where you are
unsure of an existing marker or you plan to travel in a direction
away from an existing line marker. In any case, until you are
familiar with the cave system, you can only be confident of one
direction, and that's the one you came in from. To avoid confusion
during your recrossing of this intersection, use two line arrows to
identify the route you must follow to return to your original entry
point. Line arrows are always preferred at intersections. Even as
temporary markers, many prefer the simple, but effective
information conveyed by a line arrow.
Plastic arrows identifying two exits at "T"
You are unlikely to see an intersection marked this way in a North
Florida cave. But such intersections are common in the Caribbean.
Any time a suspect intersection is encountered, it is best to add your
own arrow (don't rely on a clothespin) to confirm your exit route.
Four-line intersection - too much of a good thing
This drawing shows the line situation depicted on Page 42 with a
whole bunch of additional arrows. Initially, one might believe that
additional arrows will be a help when negotiating the intersection,
but in actual fact they may cause the team to waste precious
moments decoding the information presented.