Roomba, the robotic vacuum, is gaining an indoor Wi-Fi mapping feature in its iRobot app later this month. The Wi-Fi Coverage map feature means Wi-Fi-enabled Roombas will be able to produce a map of indoor signals, which show weaker areas and signal dead zones. Some Roomba models can be controlled remotely using Wi-Fi, so the feature is handy in terms of understanding where the robot might be out of range for remote control.