Definition
In a GPS receiver, the control element is the part of the unit a pilot physically interacts with — the buttons, knobs, touchscreen, or keypad — used to enter data, select functions, and manage the system. It is one of the three functional parts of a GPS receiver, alongside the receiver element (which picks up satellite signals) and the display element (which shows information).
Plain English
It is the part of the GPS unit you actually touch to make it do things — the buttons and knobs you use to type in a destination, change pages, or pick a function.
Context Anchor
Seen in GPS system descriptions, usually alongside the space element, which is the satellites, and the user element, which is the receiver in the aircraft.
Derivation
‘Control’ comes from Old French ‘contrerolle,’ meaning to check or regulate. ‘Element’ comes from Latin ‘elementum,’ meaning a basic part of something. Together it means ‘the basic part you use to control the device.’
Why Pilots Care
The control element maintains the precision and reliability of GPS signals that pilots depend on for accurate navigation and instrument approaches.
Analogy
It is like a control room for the GPS satellites: the pilot uses the service, while the ground system keeps the satellites lined up and current.
Intuition Check
Do not read “control element” as a cockpit control or something the pilot adjusts. In this context, it means the ground-based part of the GPS system that manages and updates the satellites.
Example Sentence 1
The pilot used the control element on the GPS to enter the new destination airport identifier.
Example Sentence 2
Even though pilots never see it, the control element ensures the signals used for approaches remain accurate.