Editing Degree Confluence Project (section)

==Requirements==
The precise location of each degree confluence uses the [[WGS 84]] horizontal datum, and visitors to degree confluences almost always make use of [[GNSS]] receivers.<ref>{{Cite journal |title=Geospatial Techniques for Managing Environmental Resources |url=https://link.springer.com/content/pdf/10.1007/978-94-007-1858-6.pdf |journal=SpringerLink |date=2012 |language=en |doi=10.1007/978-94-007-1858-6 |isbn=978-94-007-1857-9 |editor-last1=Thakur |editor-last2=Singh |editor-last3=Ramanathan |editor-last4=Prasad |editor-last5=Gossel |editor-first1=Jay Krishna |editor-first2=Sudhir Kumar |editor-first3=AL. |editor-first4=M. Bala Krishna |editor-first5=Wolfgang }}</ref> For a ''successful visit'', the visitor must get within 100 metres of the confluence point, and post a narrative and several photographs to the project website. A visit, or attempted visit, which does not conform to these rules may still be recorded on the website as an ''incomplete visit''. The project encourages visits to degree confluences which have been visited previously, and many confluence points — especially in non-remote regions of developed nations – have been visited several times.

The total number of degree confluences is 64,442,<ref>Latitude lines 89°N to 89°S (179), multiplied by 360° of longitude (360), plus the two poles (2) = 179 × 360 + 2 = 64,442.</ref> of which 21,543 are on land, 38,409 on water, and 4,490 on the [[Antarctic]] and [[Arctic]] ice caps.<ref>{{cite web| url = http://www.confluence.org/infoconf.php#location| title = Classifications as of August 4, 2007}}</ref> The project categorizes degree confluences as either ''primary'' or ''secondary''. A confluence is primary only if it is on land or within sight of land. In addition, at [[latitudes]] greater than 48°, only some points are designated primary because confluences crowd together near the [[Geographic pole|poles]].<ref>{{cite web| url = http://www.confluence.org/infoconf.php#poles| title = Poles Problem}}</ref> Both primary and secondary confluences may be visited and recorded.

In addition, visits to certain special geographical locations can also be reported (special visits). For example:
* [[Ciudad Mitad del Mundo|Middle of the World]] monument (0°, 78°27'08"W)
* Centers of continents
* [[Royal Greenwich Observatory]]