Before launching my altitude on the iPhone app showed the Phantom V+ 3.0's altitude at 32 feet.   It toggled s2 to reset home point but it didn't change.  I had to keep in mind that I needed to subtract the 32 feet for the entire flight.  
Question - what is the procedure for resetting or base lining the altitude to 0.0 feet prior to launch.   

Thanks,

-TSP181

1.  are you in phantom mode (not naza)?  because you said 'toggle s2 to reset homepoint' which is phantom only, naza is different.  im just curious here i know it isnt your issue.

2.  i thought that altitude isnt reset during flight but was just set as 'zero' at takeoff (and anything above that becomes + and anythign below that becomes -.  i didnt think you could 'reset' altitude (midflight or otherwise).  i thought a homepoint reset just set the gps coords NOT the takeoff altitude.

I am in naza mode, flying in GPS.  I didn't  realize the home point reset process was different in naza.   


I had an altitude of 30+ feet "before" Take off.    i thought it would read zero at startup.   

ive seen that too, i thought it was a poor reading from the barometer but i cant say for sure.  i have seen odd altitude readings like that before.