These are 2 different things. The meaning of "move the take off point to a new location." means somewhere new magnetically. like a different town. You only need to do a compass calibration when you fly from somewhere different, by say, 20+miles or so. Once you do a compass calibration at a good place and it works, then shouldn't have to do it again.
The home point is something completely different. It is the GPS location, that the Phantom records, as a "home point" ( the "where do I go if I loose connection and need to do a RTH )
When Should I Calibrate?
You do not need to calibrate before every flight and in some cases you definitely should not calibrate. That doesn't mean you shouldn't ever bother doing it. It only takes one time for it to go very wrong. The most important aspect of compass calibration is making sure the magnetic "neighborhood" around your Phantom is consistent between calibration and during flight.
IMPORTANT: The ideal place to calibrate is an open field with nothing metallic in a 20ft radius. Keep away from drainage pipes, irrigation systems, rocks, etc.
• DO Calibrate
◦ Mod value out of whack or compass error reported (check area first).
◦ Circling in flight or not flying straight (also check for other possible causes).
◦ New equipment added or removed / new firmware installed.
◦ Location change (greater than ~250 miles).
◦ Significant change in terrain (e.g. to / from mountains).
◦ If you just degaussed your compass (BTW, don't degauss unless instructed).
• DO NOT Calibrate
◦ If near concrete, buildings, and hidden or overhead power lines / pipes / etc.
◦ If you're indoors, on a paved surface, on a stone surface, on the beach, on a boat, on a balcony, near a car, near speakers, etc.
◦ If there are metallic (ferrous) objects nearby or you're not sure
• Pre-Calibration Checklist
◦ Everything used in flight should be powered during calibration, e.g. GoPro, tracker, etc.
◦ Remove all metal from within 10ft radius, e.g. watch, phone, ring, belt, coins, controller.
◦ Calibrate on grass or dirt and not on concrete, asphalt.
◦ Calibrate on a level surface if possible.
◦ A cardboard box is a good idea to get it off the ground and level.
• How to Calibrate
◦ Power up your Phantom and accessories as normal.
◦ Wait until your Phantom is ready to fly.
P3 / P4: Select CALIBRATE in the SENSORS section of the app. Click OK.
◦ Confirm solid yellow rear lights.
◦ Pick up the Phantom and turn it smoothly and steadily a full 360 degrees until the lights turn solid green.
◦ Point the front of the Phantom straight down and repeat until the lights turn off and resume normal flashing.
Note: Don't be concerned if your gimbal reacts poorly to being face down, keep turning as normal.
◦ Optional: power off and restart Phantom.
◦ Enjoy your flight!
If for any reason, you do not complete any of the above steps smoothly and evenly, restart the process.