Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: How important is a strong cell phone signal for this device?The Garmin map shows a strong signal but my personal experience is that it is very weak?
Document: This is the Garmin GTU 10. It is a GPS locator beacon. I'm using it on board my FPV RC airplane. I can use it to locate my plane with my phone. It shows my location and the location of the beacon on a map. If the plane goes down, there is a strong possibility that the battery powering the camera and autopilot will be disconnected. This device has it's own power source and should stay powered in the event of a crash. $140 for the unit from Amazon.
I can also see when the cell-phone signal is weak, or the satellite signal is weak. This rarely happens, but hills and remote areas can temporarily affect these signals. My husband also puts the tracker on the dashboard of the car when he's on long trips to cycling events, and it's great to be able to see where he's traveling (and his speed!). Overall, I'm very happy with this tracker.
The android app works well, and it also shows battery level, cell signal level, etc.. so for that functionality, it works solidly well - really like it - and it does exactly what I got it for - peace of mind (and occasionally they check where I am during a ride - kinda interesting and real-time). GPS has always been accurate (suburbs, not city).
Additionally I have noticed that a location request does not supply  coordinates, just a dot on a Bing map. I lost the device briefly and coordinates would have helped me to find it more quickly.UPDATE: A Garmin tech got back to me and indicated that if the device is on and stored where it cannot receive both GPS and cellular phone signals, it will deplete the battery rapidly as it seeks to connect.
I continue to charge the device daily to ensure a full battery if needed. The smartphone app is particularly nice, which I have downloaded to my iPod Touch.3rd Update: Garmin has posted on their website that the device will not be supported, i.e. useless after January 1, 2017 due to elimination of required supporting cell phone service. Too bad, it has been great so far.
I live in an area with decent AT&T; coverage where I ride (northern NJ) and the GPS aspects of the unit are very good - I put it in my camelbak backpack and it does a great job of receiving the satellite signals and getting the cell phone signal out.
It updates every 15 seconds with this feature. You also can see the GPS signal strength along with the cell strength. There are some other things with this latest update also. So I'm going to check them all out, and report later. But for now, it finally seems like I got the device I wanted to have in the first place. I give it an extra star for now, so we'll see.
I work with a lot of GPS tracking units. These Garmin units are very well made, and extremely accurate. The website is easy to use and so are the phone and tablet apps. The functionality of these units is great, they are small, light, and strong, in my opinion they are the best &#34;all around&#34; tracking unit commercially available for tracking only purpose.
I stick these on my small children whenever we're in a large public place where they can easily get lost. I also use them to track farm vehicles, so make sure they don't walk off on their own. Probably good for tracking spouses or significant others. :)You can set a geofence so if the device leaves the designated area on the map, it will text or email you. The interface for setting up a geofence is reasonably easy to use on both the phone and web.
I fly a rather expensive quadcopter for shooting aerial videos and after hearing others talking about unplanned &#34;flyaways&#34;, I knew I needed something to protect my investment. I  chose the Garmin as it was pretty much &#34;ready to go&#34; right out of the box. It`s small in size and communicates nicely with my Iphone. Similar trackers either didn`t have much range or required a cell phone card and rather costly fees per month.
Answer: My area is just at the edge of good coverage for AT&T.; It's able to lock on to my dog even when she is under the bed, which really surprised me. If she goes into one of the low areas of our woods, it will lose her. It uses both satellites and cell towers to get a good lock. Problems arise when it can't get both. Then it will show her to be about 20 miles away at a local lake. If it does that, I just wait a few minutes and ping her again. The problem with a poor signal while outside the set geofence is that it will drain the battery quicker than usual. AT&T; has been expanding its coverage area in recent years, so you may actually get a better signal than you expect.