The category "<bearing_spec>" can be expressed as follows:

<bearing_spec>

<bearing_number>

<bearing_number-pl> <bearing_unit-pl>

<bearing_number-sing> <bearing_unit-sing>

<bearing_number-three_dig>

<bearing_number-three_dig-pl> <bearing_unit-pl>

<bearing_prefix> <bearing_spec-recursive>

<cardinal_direction>