A Survey Control Network is a series of well-spaced and interconnected markers, also called monuments, with accurately determined positions. It enables surveyors and others to determine for any point, feature or structure a unique numerical address known as a coordinate. These markers are generally concrete structures set in the ground on which a brass plug is set with a specific centring mark.
With the rapidly emerging technology of the Global Positioning System (GPS), a GPS based ground network replaced the conventional terrestrial network. This GPS network also became the ground infrastructure behind a new reference system known as NAD83 (CSRS) and adopted through an amendment of the Surveys Act (S-17) April 1, 1999. It will be identified as the New Brunswick High Precision Network (NBHPN).