▁names ▁on ▁mapping . ▁For ▁example , ▁one ▁of ▁the ▁entries ▁in ▁its ▁sample ▁database ▁is ▁Mid land ▁Regional ▁Hospital , ▁Port la o ise , ▁building ▁ID ▁ 1 0 0 0 3 1 0 5 ▁( at ▁IT M ▁ 6 4 8 5 5 5 . 8 2 2 , ▁ 6 9 8 8 3 3 . 0 8 8 ). ▁ ▁Altern ative ▁location ▁codes ▁ ▁Several ▁coding ▁systems ▁emer ged ▁in ▁Ireland ▁in ▁the ▁years ▁before ▁the ▁introduction ▁of ▁E ir code . ▁All ▁of ▁these ▁systems ▁took ▁the ▁approach ▁of ▁coding ▁ge ographic ▁locations ▁rather ▁than ▁postal ▁addresses . ▁None ▁of ▁the ▁systems ▁are ▁compatible ▁with ▁the ▁sorting ▁requirements ▁of ▁An ▁Post , ▁as ▁they ▁do ▁not ▁encode ▁a ▁Post ▁Town ▁into ▁their ▁code . ▁The ▁first ▁three ▁characters ▁of ▁an ▁E ir code ▁relate ▁to ▁a ▁Post ▁Town ▁that ▁An ▁Post ▁have ▁defined ▁to ▁facil itate ▁manual ▁sorting ▁of ▁post . ▁As ▁they ▁only ▁encode ▁a ▁location , ▁they ▁are ▁not ▁capable ▁of ▁providing ▁a ▁unique ▁code ▁for ▁every ▁address , ▁for ▁example ▁multiple ▁apart ments ▁in ▁the ▁same ▁building ▁would ▁have ▁the ▁same ▁code . ▁ ▁GO ▁Code ▁The ▁GO ▁(" ge e - o ") ▁Code ▁was ▁developed ▁by ▁Go ▁Code ▁Ltd . ▁in ▁Dublin , ▁ 2 0 0 7 . ▁It ▁is ▁a ▁multi - character ▁al phan umeric ▁ge ographic ▁( r ather ▁than ▁postal ▁routing ) ▁code ▁calculated ▁from ▁latitude ▁and ▁longitude ▁that ▁var ies ▁final ▁accuracy ▁according ▁to