Ko ngā pou ārai haumaru ka taea te hoki whakamuri he pou ārai i hangaia hei whakahaere i te urunga o ngā waka ki ngā wāhi kua herea, motuhake rānei. Ka taea te whakaara ake hei aukati i ngā waka, te hoki whakamuri rānei ki te whenua ina hiahiatia te urunga, e whakarato ana i te ngāwari me te haumarutanga pai ake.