The rules that use the category "<bearing_spec>" are:

<heading-not_prefix>

<bearing_spec>

<bearing_spec> <orientation_word>

<heading>

<bearing_spec>

<bearing_spec> <orientation_word>

<bearing_mod-gapsout_null-gapsin_null>

<bearing_adj> <bearing_spec>

<bearing_adj> <to_prep> <bearing_spec>