The number and letter are switched. This question needs more context to get a accurate answer.
Created a new multilevel list style to add to the gallery
<em>The answer is: your GPS unit cannot send signals to the satellite when it cannot reach it by line of sight.
</em>
<em>
</em>
<em>GPS signals are based on frequencies that can be blocked by solid objects (like walls and roofs). A GPS device is using a series of satellites to detect and see where it is physically located. These frequencies are sent from these plates (satellites) and we cannot expect it to go through all kinds of barriers. When you use a GPS inside a building, a wide variety of physical barriers and potential interference sources make it difficult for the device to detect your location accurately.
</em>
<em>
</em>
<em />
Answer:
Bottom of the case
Through a connector
Explanation:
Regularly we must see the bottom of the case to remove some screws, and then move the keyboard, but first, you have to remove a connector.
The keyboards have evolved from windows and IMB built their own keyboards for desktop, and now we have digital keyboards, and replace a keyboard in a laptop can change for the model or the size.