Tomahawk Buttress sits just to the right of Shangri-La slabs. There's a short ramp in front of the formation where three of the five routes begin (Kitty Hawk, Chickenhawk, and Tomahawk).
Routes on this formation are (from left to right):
5.12+ project (on the west-face, in the gully) Kitty Hawk (5.8) Chickenhawk (5.10a) Tomahawk (5.10d) I'm Your Huckleberry (5.9) (down the hill a bit by a cedar tree)
All of the routes on this formation are gear routes, and there are no anchors at the top of the formation. Descend via the Shangri-La raps (a 60m will get you down most of the way down the gully).
Approach as for other second-band routes (up the gully from the road, hang a right and rock-hop past The Troll and continue further east). Shangri-La slab is the most striking feature aside from the namesake triangular flake of Tomahawk Buttress that will let you know you're in the right place.
The approach is probably ~30 minutes if you're finding it for the first time.
Let me know if the GPS is working-- google maps is being weird.