ArcMap GPS Support takes as input a feed from a GPS receiver and displays the current location on the screen. You can also store locations from the GPS receiver in a log for archival or real-time digitizing purposes (see Writing GPS locations to a log). You can answer the question “Where am I?” by accessing ArcMap GPS Support through the GPS toolbar in ArcMap (see Adding the GPS toolbar) or by writing a custom application using ArcObjects.
The location is displayed as a user-defined marker symbol. You can have the angle of the marker symbol reflect the direction of motion (bearing), the size based upon the current speed of travel, and the color based upon the altitude. Previous locations can be displayed as a trail of markers or as a line that you can also customize. The trail of previous positions can reflect changes in bearing, speed, and altitude. See Changing the display options for more information.
You can keep the location visible on the screen by panning as needed or have the display pan automatically (see Keeping the current location in the view). For applications like in-car navigation and routing systems, you can snap the location to specified features, such as a street centerline. You can store locations to a log file either in streaming mode (at a specified rate or distance apart) or one at a time. When a log file is specified, you have the option of choosing which columns are added to the output feature class.
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