Uniden iGO50 Owner's Manual page 21

There are screen buttons and data fields on the screen to help you navigate.
During navigation, the screen shows route information.
By default, only one data field is displayed in the bottom right corner. Tap this field
to see all route data fields.
Tap any of the data fields to suppress others and display only the selected one.
The data fields are different when you are navigating an active route and when
you have no specified destination (the orange line is not displayed).
Default data fields when cruising without a destination (tap and hold any of the
fields to change its value):
Field
Shows your current speed given by the GPS receiver.
Shows the speed limit of the current road if the map contains it.
Description
Page 21