Survey methods

Once you select a measurement mode, the Survey method bar appears below the map.

You must complete a calibration before you compute offset or intersection points, or stake out points. If you change the calibration after computing or staking out these points, they will not be consistent with the new coordinate system and any points computed or staked out after the change. For more information, see Site calibration.

To add nodes to a survey, select the appropriate survey method from the Survey method bar. Drag left or drag right across the Survey method bar to view more Survey method items.

You can modify the appearance of the button bar to hide survey methods you don't use. To do this, in the Project list tap and then tap General. Tap next to the Appearance field and then tap next to a button to hide it or tap to display a button you have previously hidden.

Select...		To...
	GNSS	Add nodes to the survey using coordinate data from a GNSS receiver. When measuring control points or point features, a node is created after a single GNSS observation (epoch) or by averaging multiple epochs. When measuring line or polygon features, add multiple nodes to the feature using single or averaged GNSS epochs.
	Snap node	Snaps graphical elements onto existing nodes. You can also use it to snap together nodes to form new features after other nodes have been undone or deleted.
	Free node	Add a node by tapping on the map.
	Chain & offset	Add a node offset from two existing nodes. This method is useful if, for example, you cannot measure a GNSS position for the target node but you have two nodes nearby you can use as reference nodes. You would draw a construction line between them and then measure the chain distance along the construction line until you are in line with the target, then measure the offset distance to the target node.
	Extend horizontal	Add a node in line with two existing nodes.
	Bilateration	Add a node using intersecting arcs from two existing nodes. Use this method in the following scenarios: for a single feature, start from one reference node and measure the distance to the target, then move to the second reference node and measure this distance to the target. to quickly collect multiple features or a line feature with a laser rangefinder to two known positions on the map (for example, collected with the GNSS method) stay at the target (such as a manhole or a tree) and take measurements to the two reference nodes, for example the corner of a building. Then move to the next target and take new distance measurements to the same reference nodes.
	Construction	Create construction lines or a construction circle from existing nodes and graphic elements.
	Enter data	Add a node by entering the coordinates of the node. The generated node is a free node.
	Replace	Replace parts of the geometry of a polygon or polyline using another data collection method, for example, GNSS measurement, Snap to node, Free node, or the COGO functions such as Chain & Offset or Extend horizontal.
	Move node	Adjust the geometry of a feature by moving a node using another data collection method, for example, GNSS measurement, Snap to node, Free node, or the COGO functions such as Chain & Offset or Extend horizontal.
	Split line	Split a line in an existing polygon or polyline feature by adding a node to the line using another data collection method, for example, GNSS measurement, Snap to node, Free node, or the COGO functions such as Chain & Offset or Extend horizontal.