USE .visible /// first false / then change position / then make it visible again!!!!
B4X:
Sub bam_tick
boom.Enabled=False
mark(hr).Visible=false
Dim NewPosition As LatLng
NewPosition.Initialize(ooo,15)
ooo=10+NewPosition.Latitude+0.0001
m(1).Position=NewPosition
Sleep(50)
mark(hr).Visible=True
boom.Enabled=True
End Sub