Recently i lost my Drone since i was so stupid to move away from where the drone started. When I lost contact the drone went back to where it started: on a boat that was no longer there... Halfway the battery reached the point of where the drone immediately lands. Three search and rescue actions later we declared the drone as "lost". I learned a couple of things: 1) If I would have written down my telephone number on the Drone, someone who would find the Drone could contact me.. 2) If I would have recorded the FPV with On-Screen-Display, I could have seen in arrears where the Drone went down.. 3) If I would have attached a smart GPS Tracking Device to the Drone, I would have been able to locate the drone.. 4) If i would have asked someone to keep pointing at the Drone whilst it went down, we would not discussed where it went down. 5) If I would have staid at the location where the Drone started, it would have come back there itself (Fail-Safe). I now have a new Drone and I have added the following: a) Loc8tor Cat-Finder (less than 5 grams) b) Waterproof Sticker with my contact details c) iOSD Mini and FPV Screen with Recording Capabilities d) Flytrex Core-2 GPS Logger (will not help to find your drone) I also tried a GPS/GSM Tracker, however, the device was relatively heavy which shortened the max. flight time too much. I also was recommended the i-Got-U GPS logger (30 grams) but have replaced it with the Flytrex Core 2 which only ways 3 gram. If you record your FPV session and if you have an iOSD, you can see on the recorded video what the distance/direction was, when the Drone went down. From experience i know that the iOSD alone does not suffice (when the drone takes off, chances are that you panic and do not watch/remember the displayed iOSD values). The iOSD and the FPV does not work when the Drone (battery) has a technical problem. Hence, the lightweight WiFi Cat Finder is your last resort as long as the Drone stays out of the water. Just walk/drive/sail in the direction of where you think the drone is, until you pick up a signal (the Cat Finder can be found within a WifI range of approx. 90 meter from the Tracker). Then, follow the direction that the Tracker is pointing towards. The more frequent the beeps from the tracker, the closer you get. For those who don't want to add extra stuff on their Drone I recommend to agree with bystanders to keep pointing at the Drone when the contact between the pilot and the drone is lost. (i.e. same life-guard procedure as used when someone falls overboard). If all else fails; at some point someone is likely to find the drone. If only one thing, you can use the recovered drone for spare parts (which, as you may know, come in handy). Using the contact details on the sticker he/she may contact you. (if you plan to fly on places where you should not fly, this may not be a good idea. I try to obey to the rules so i have no problem that people know that it is my my drone that unexpectedly comes down). I sometimes fly from a boat and i accept that this can cause risks and can make the failsafe useless. I have however decided that i will not further than 50 meters from a moving boat anymore. Also I will now fly back when the battery has 50% left (extra safety margin). When something breaks, within 50 meter I can find it. I was recommended a GetterBack device in this thread.http://www.phantompilots.com/viewtopic.php?f=9&t=16701&start=10 This device will inflate when it drops in the water. The Drone is linked to the Getterback device with a wire of 350 feet. This Device may be usefull for people that fly over water often and who do not mind losing a bit of flight-time and speed (the getbacker device is quite bulky). Hopes this helps to avoid losing your drone for whoever reads this.