Marco Polo Ultralight Drone/UAV/Model Rocket Location and Recovery System – No GPS or Cell Service Required – No Monthly Fees – Never Lose your Drone Again - Starter System for 1 Aircraft

I am using this with the DJI Mavic Pro Drone and it works great. I attached it using the supplied Velcro to the vertical rear end of the craft just above the back light. I attached it with the Antenna on the Tx turned downward. It does not have any noticeable effect on the flight characteristics and stays on firm flight after flight.I ran some tests on battery life and after 10 days the transmitter it is still running and responding when I ping it. I will update the post with the exact number of days until the battery dies and needs recharging, but so far it has passed the manufactures ten day statement :)I tried it out on a distance test and with several concrete structure in the way I was able to get a signal from about 1/2 mile out with 44% signal. I am a amateur radio operator so I can say with a fair degree on confidence that this would have no problems working at 2 miles out if it was line of sight. For me the test that I was more interested in was how it worked when blocked by lots of obstacles, because in the real world crash you are most likely not going to have a clear line of sight. The Marco Polo passed my test and my expectations. I was able to use the DJI Go4 app and get within close enough distance that I could then easily use the Marco Polo to locate the Mavic's exact position.One good thing to know with the Marco Polo is that it does not create any RF interference. The MP is a passive device that listens for a ping from the handheld locator. Once it picks up that ping it starts to transmit back. The time between you first starting to ping and getting back a response is about 20-30 seconds and after that it updates with new direction info every 10 seconds. Surprisingly the direction arrow is pretty darn good. In 80% of the pings it was right on target and in the other 20% it was +/-30 deg of the target. As you move closer the accuracy improves and the signal strength keeps going up, so there is no doubt you are getting closer.If you own an expensive drone and you fly it out far over land, the Marco Polo RC tracker is really a worthwhile investment.

Works well for my little 250 race drone. Makes me feel better that if for some reason I lose tx or video signal it won't be gone forever like my first one. If I would of had this on it I'm sure I would of at the very least know what area to look in the heavily wooded area where it went down. Also pays for itself if something were to happen. Great battery time, usually lasts a week of flying 5 -8 batteries a day. Easy to plug in before bed and fully charged the next morning. Receiver also keeps a good charge and comes with a USB charger in case you need it and battery is dead or low. Expensive insurance plan but cheaper than replacing the drone and easy to to take off and mount to something else.

The product arrived way ahead of schedule - a good start. Packing was sufficient, no problem with damaged goods.The product seems very well put together. The locator housing is plastic, but it is thick and feels very solid - not cheap. It seems easy enough to setup and use. To that end, the instructions are fantastic. Easy to understand, good grammar, no misspelling. There is good detail as to how it operates. That's very rare these days. 5 stars just for that.Product seems to work (tested indoors) although I have not yet tried it outside at some distances yet.Expensive but would purchase again. It will go on a drone that cost 10x the price.

So far the unit performs without a hitch. I have placed the tag a few feet off the ground 5 or 6 times in heavy cedar and driven up to a mile away around hills and small rocky canyons without direct line of sight. Signal strength dropped down to 5 to 10% but was still able to get a direction lock. You have to keep walking around and find the most consistent direction path as it will give erroneous readings not always pointing in the correct location.Given the terrain I'm using the unit in, I personally would highly recommend the Marco Polo

One very important feature of this unit is that it does not depend on cell tower reception to function. Aside from saving money in not paying a monthly cell bill, if you fly, as I often do, in somewhat remote or hilly areas, you do not have to worry about the cell reception there. I have checked my cell phone and have no reception, so what good would the other type of tracker do you?I have not yet used this in the field yet (just got my drone back from a crash in the wild?! :-( ) but I did use it in a nearby field on some practice runs. It is highly advised you do this!! Once your drone flies away, you will be super stressed, and that is not the time to sort out in your mind the vagaries of radio telemetry tracking. Get your practice first. Otherwise, during practice the MP worked as advertised and certainly worked well during my 100 yard test. That said, if you have used a hand held GPS receiver, such as hikers use, you are already aware of signal bounce. That means that while walking along a path of some 20 feet you might read the device as giving conflicting heading directions. If you keep moving forward, you will see that the true direction you need to head will be the one most frequently repeated. Use signal increasing or decreasing signal strength to corroborate that you are heading the correct direction.BTW, you probably know that when losing the drone, the video feed and the indicated track downloaded to the remote controller are the best clues as to where to begin your search. Use those. Plus, if the drone falls behind a structure or over a hill, you may not get a strong signal from the transmitter. Be flexible in your thinking to properly interpret the information your RC and Marco Polo are giving you.Finally, finally: I had some initial confusion in setting up the MP. I emailed Eureka and got a reply from within 2 hours. That's speed service and great customer care. This is a company you can have confidence in.