to be quite honest with you, i personally would not be taking my MM to 300ft to 400ft to begin with, it is so small and at those sort of heights, you would be struggling to see it at any sort of distance, apart from studying how the trees are moving and going up in stages ,i have found a good way to have a safe flight with my drone is to go up to around 20ft ,and hover, and observe and listen to the drone as it fights the wind ,you will get a good idea if it is to windy to fly,one other way to judge wind speed is to look at the clouds and see how fast they move across the sky in spite of the specs of the MM it is more at home being flown lower and nearer than something like a MPP or
M2P