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Please help

Im new to this garmin astro 220 thing..i bought i brand new garmin astro that came with a dc 40 collar..well the guy i got it from kept the 40 and sold me the unit...well i mange too buy two dc 30 collars fairly new...now the question is what do i need to get such as what is a map card...ect...thanks for reading

Thanks I bout one already