"@Vinh K: Wow, a reply to a post of 3 years ago :-) I don't even have this copter anymore. But to answer your question: No, it cannot be done without GPS. For autonomous flights GPS is the only way for the copter to know if it's on track."

"Nice find, interesting!"

"@Euan, coincidentally, I looked at the MD4-1000 specs as I was curious as well what it could carry.
I think your numbers are not correct. The specs state the maximum takeoff weight is 5.5 KG.

Weight: ca. 2,650 g (depending on configuration)…"

"@Rob :-) you are right, it will be expensive but then again you can't write-off all the cost to just medicine delivery. This is experimental still with the expectation of future gains, and not all financial either."

"@Euan: Well, I am Dutch and not German, but can read/write German reasonably well.
Indeed the article says the corridor is for the research project, but if you read the (German) press release, which is more extensive than the English one, and listen…"

"@Euan:
Translated from the German press release:
"Together with the two research and development partners, the Institute of Flight System Dynamics, RWTH Aachen and the Microdrones GmbH, went through DHL package one led by the Lower Saxony Ministry…"

"Well... one of the impressive points is that it is entirely legal. All authorities, local and state and Air traffic control have given their consent. The drone will fly through an appointed corridor where no-one else is allowed to fly.
Secondly,…"

"Nice vid and I like the music and editing you did. I do notice the quad being jittery, something you can probably eliminate through tuning - PID settings perhaps a bit too aggressive. But well done. I may be willing to donate an APM 2.5 I have lying…"

"Or this Tracker, also at 45 USD, I actually own this. You can even text it and it will call you back, all silently, so you can listen to it like a spy device! Or just give it to your kids as a phone :-)  You may prefer to remove the plastic…"

"Under normal circumstances, with signal loss, either the quad goes RTL or it continues in Auto mode, but that too depends on how you set the parameters in Mission Planner. There's a lot of value in getting a deeper understanding of the various MP…"

"Lol...treasure hunt"

"I hope you find it, however the RTL logic is as follows: If the RTL height is set to 0, it will indeed fly back at the altitude it was at when it switches to RTL mode. If the default RTL altitude is 15m, then it will return at 15Mm ONLY if it is…"

"Steve, just to be sure, did you have the settings correct that it would RTL upon loss of signal?
Did you test RTL functionality?"

"I am sure you will succeed in growing this. If you ever want to exchange thoughts or need help, give me a shout."

"I am stunned to see this, as just over the last few days I had developed precisely the same idea to establish a place where drone operators could connect with clients. The idea came to me only a few days ago, and here it is as a 'product'  already!…"