We are quoting overland lengths of 100 kM, 72 km, and 32 km.

What is the definition of an overland length? There are restriction on the length and geometry.

In the above cases, the 100 km is not complex and can be done in one continuous length, the 72 km is very complex and may not be capable of one length. ■

Searching for clarification of the topic seems to be increasing the implicit confusion.

I suspect a hidden rope trick.■

The definition continues to change and who you talk to.

Often we see specifications read over 1000 m length. Others use terrain complexity such as 300 m long x 100 m up then 300 m down x -100 m might constitute an overland meaning over-the-land.

In the later case, maybe +500 m might due. Then there are the regions of the world, such as Australia, where long is beyond 5 km, and maybe 10 km. I would guess Oz thinks over 3 km might qualify. However, we did a 1.6 km downhill that was called an overland.

Sometimes a sequence of conveyors are labeled "overland system". Maybe 1 and 2 or 3 km in sequence with differing directions fits.

It is what a client makes of it. ■