How many mega bites in a killer bite and and in a giga bite is the same as the metric system of 10 ,100,and th

i would like to buy a new sd-mm card for pda and am trying to work out what size card to buy for a map format of europe that is 1.3 gb ,as it will be navgon 5 soft ware on a fujitsu siemens pda would a 2gb card be ok thanks