Or ……
“Hawaii Five-0".
Five-0 was the designation of the unit in the series. It had no meaning prior to the show. Some people believe the writers were paying homage to Hawaii (where it was filmed) being the 50th state, and that’s why they named the show Hawaii Five-0.
I fly a Mini using DJI Fly app. If I stand on an elevated area of land and fly away from myself so the land below the drone is dropping away, does the altitude reading on the app take account of this?
No, unfortunately not.
I’ve tested this by taking off from a hill at 20ft AGL and then flying into a valley. So whilst my MM was about 400ft AGL when it was well into the valley (I know a song about that) the app still shows 20ft.
It’s a good idea to check something like Google Earth to get an idea of how high AGL you might end up being over the terrain you intend to fly over.
Oh, and check your RTH altitude… you could possibly end up being way over 400ft AGL if you use it in these circumstances.
Ned
Ned is correct.
Your drone’s altimeter reading is based on the barometric pressure changes commencing with take-off being zero.
The drone has no knowledge of the contours and shape of the land beneath.
Coming soon to a building near you . . .
CAP1789 April 2020 indicates (when EASA regs commence), in the Open category, class A1, A2 and A3, flights over 400ft can be allowed if the limit is breached when climbing above a building or structure.
Here’s an excerpt from Annex, Part A (open category)…
UAS.OPEN.010 - General provisions. This rule sets out the subdivision of the Open category into the A1, A2 and A3 subcategories, plus it also provides some additional stipulations/moderations regarding the 120m (400ft) maximum operating height requirement that was set out in Article 4 as follows:
• The unmanned aircraft must not be flown at a distance greater than 120m (400ft) from the closest point of the earth’s surface, but:
• this height can be exceeded when overflying a fixed obstacle provided that:
• The person in charge of the ‘obstacle’ has granted permission (i.e. the reason for the flight is related to that obstacle) • The unmanned aircraft is not flown more than 15m above the top of the obstacle and must be kept within 50m horizontally of it The logic here is that the obstacle already presents a hazard to manned aviation so, provided the unmanned aircraft is kept close to the obstacle, there will be no additional threat to manned aircraft.
• model gliders (unmanned sailplanes) of up to 10kg in mass may be flown up to a height that is 120m (400ft) above the remote pilot. This allows more freedom to operate slope soaring gliders, whilst still remaining within visual line of sight.
Thank you @Ned and @Pterodactyl. it is worth me keeping this in mind in future.
Rather than fly through it go to higher ground and fly over it, as you will get round the 400 f limit as your height limit will be extended by your take off height
Not sure if I am reading your comment correctly but if you mean to fly back to the same point you are still over 400ft from the ground irrespective of were you took off from.
If the cloud is sitting at 400 feet i can climb a hill thats 400 feet and fly over the cloud .the hight limit is 400 feet from take off height.an example max take off height was 1036m i can fly 400 feet max above it
Your drone or model aircraft must never be more than 120m (400ft) from the closest point of the earth’s surface.
Exactly right, I read your comment that you could climb the hill, ascend to 400 ft then fly out from the hill to your previous position, meaning only 400 ft up from take off point but over 400 ft from your initial position.
I am totally confused now, that is exactly what i showed in my modded drawing. You have just shown the same drawing again.
Well technically if you flew through the cloud at ground level ie a cloud inversion you would be breaking the drone code unless lol you flew from then end of the inversion
Reread what it says
In the example above, If you are flying with INAV, return to home with
nav_rth_alt_mode = MAX
Will bring you back higher than the 400ft 
