Loiter + GPS bad results

**Details**
GPS OK
Change mode - STABIIZE, ALT_HOLD, LOITER and RTL

**Comands**
*Stabilization*
mavgraph.py 103.BIN "ATT.DesPitch" "ATT.Pitch" --flightmode=apm
mavgraph.py 103.BIN "ATT.DesRoll" "ATT.Roll" --flightmode=apm

*Loiter*
mavgraph.py 103.BIN "NTUN.DVelX" "NTUN.VelX" --flightmode=apm
mavgraph.py 103.BIN "NTUN.DVelY" "NTUN.VelY" --flightmode=apm

*GPS*
mavgraph.py 103.BIN "GPS.Lat" "GPS.Lng" --flightmode=apm
mavgraph.py 103.BIN "GPS.NSats" "GPS.HDop" --flightmode=apm

*Altitude measurements*
mavgraph.py 103.BIN "CTUN.BarAlt" "CTUN.Alt" "CTUN.DAlt" --flightmode=apm