Add command "Go To Here"

[zivkaziv]

Hi,
First of all, great repo.
Second, I would like to add "Go To Here(Guided Mode)"(this is how it appears in APM Planner 2. Not sure what is the message and how can I add it..
I was trying something like
send_command_long(0, 3, 3, 0.2, lat, lng, 10, mavheader.MAV_CMD_OVERRIDE_GOTO, 1);
Any advice?
Thanks