+ * Here are the required sensor signs:
+ *
+ * +along nose up
+ * +across USB down
+ * +through TH down
+ *
+ * With the board aligned to have positive accel for the relevant
+ * axis, looking down from above we have:
+ *
+ * +roll counter clockwise (nose up)
+ * +pitch counter clockwise (USB down)
+ * +yaw counter clockwise (TH down)
+ */
+
+/*
+ * On TMega v5, MPU6000 pin 1 (NW corner of chip) is placed towards
+ * the USB and antenna edges of the board. Relative to MPU6000 specs,
+ * we don't need to change any signs and so the correct values are:
+ *
+ * +along +Y +roll +Y
+ * +across +X +pitch +X
+ * +through +Z +yaw +Z
+ *