Turns out that it's "default_usn_towed_only.txt"
If you play at 1080p and want the toolbars tosit along the bottom of the screen, try this:
ToolbarsPos=0,0,0
ForceAllToolbarsOn=TRUE
TowedToolbarOffset=370,-275
HelmToolbarOffset=370,-346
DiveToolbarOffset=703,-346
SensorToolbarOffset=1035,-346
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