Snapping to existing features

Steps:

1. Click GPS > Display Options on the ArcMap GPS toolbar.
2. Click the Snapping tab. All layers listed in the table of contents are listed on this tab.
3. Click the layers to which you want to snap the GPS locations.
4. Type a new snap tolerance value, if necessary.
5. Click OK.

Tip:

The unit of measure is set by the display unit of measure in the data frame. To change the unit of measure for the data frame, right-click Layers in the ArcMap table of contents and click Properties. Click the General tab. Change the Map units value, if it is set to Unknown Units, and update Display units. Click OK when finished.