Kel-photography
lvl.2
Hong Kong
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The first 3 questions were well answered by Sploodge and would like to give you some info regarding the last question "...i have no satellite gps signal in my flat ( apartment ) and the building is made from poured concrete if that has anything to do with it ..."
It is normal to have no GPS signal inside a flat, and actually the signal is very weak at open areas with cover. You may have a test that puting you hand over your bird, you will see the GPS signal lost. happy flying!!
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