Documentation on -loc:
File should be placed in $FG_LOC_PATH
File format for location should be like below:
#!/bin/bash
# This was taken with the 787
FG_ALT="18.24666683"
FG_LON="-122.3849234"
FG_LAT="37.61990164"
FG_ROLL="0.2982890353"
FG_PITCH="-1.528827282"
FG_HEADING="174.2676595"

# Not used yet
FG_AIRCRAFT="787"