NoPublic, bureaucrat, administrator
6,632
edits
Changes
no edit summary
==Point types where the main intended use is for mines or BAC==__NOEDITSECTION__
Point types used for recording of areas are of two main types;
* single points;
* part of the polygon.
==Single points for areas==__NOEDITSECTION__
'''Reference point'''
is a fixed point of reference some distance outside the hazardous area. It should be an easily recognised feature (such as a cross-roads or a bridge) which can be used to assist in navigating to one or more benchmarks.
'''Landmark'''
has the same definition as Reference point.
'''Benchmark'''
is a fixed point of reference used to locate a marked and recorded hazard or hazardous area. It should normally be located a short distance outside the hazardous area. It should be safe to walk from the Reference / Landmark to the Benchmark.
Note: A benchmark may not be necessary if the reference point / landmark is sufficiently close to the perimeter of the hazardous area.