By this time, interest in the desert was increasing, with many people visiting Poeppel Corner. In 1986 the Friends of the Simpson Desert Conservation Park was formed in South Australia to assist with the park's conservation. In 1989 the group erected a replica of the original post at Poeppel Corner. Poeppel Corner is a well-known tourist destination today. Given the enormous physical difficulties which the surveyors faced in the task, their survey of the Queensland-South Australian border was impressive. Today, Global Positioning System (GPS) can pinpoint place by longitude and latitude more accurately. It is now apparent that the intended corner between Queensland and South Australia at 26 degrees S 138 degrees E was not achieved. The Poeppel Corner post does not correlate with the confluence of 26 degrees South 138 degrees East as was originally intended. However, the Queensland Boundaries Declaratory Act 1982 confirmed "that each land boundary of the State ... as ... defined in the Letters Patent ... by reference to a parallel of latitude or a meridian of longitude is and always has been the boundary ... permanently fixed by marking it upon on the surface of the earth before 1900...". The corner post as a survey mark is protected under the Survey and Mapping Infrastructure Act 2003 and the Survey and Mapping Infrastructure Regulation 2004 whereby a person must not interfere with a survey mark unless certain conditions are met. Poeppel Corner Survey Marker is at the westernmost of Queensland's three south-western corners located at the intersection of the Queensland, South Australia and Northern Territory borders, near Lake Poeppel - a salt lake. It is approximately west of Haddon Corner and north-west of Cameron Corner. The survey marker is within the Simpson Desert, a vast region in which linear dunes are the main landscape feature. The confluence of 26 degrees S 138 degrees E is between Lake Poeppel (immediately to the west) and a linear dune that trends SSE-NNW a little over half a kilometre to the east. There is a discrepancy of several hundred metres between the specified latitude and longitude and the officially mapped border. Land on the Queensland side of the border is in the Munga-Thirri National Park while the South Australian side is part of the Munga-Thirri—Simpson Desert Conservation Park. Poeppel Corner Survey Marker was listed on the Queensland Heritage Register on 9 November 2012 having satisfied the following criteria. The place is important in demonstrating the evolution or pattern of Queensland's history. Poeppel Corner (1880), marking the south-western extension of Queensland's border with South Australia, is important in demonstrating the priority placed on clear border demarcation by the governments of Queensland and South Australia.