Maps for geocaching in NS

I've just purchased a Magellan eXplorist and am using it to geocache. It is replacing my old Garmin eTrex Legend HCx.

I want to be able to use a much more detailed map in the "VantagePoint" program and perhaps in the GPS unit. I'm located in Dartmouth, so I'd like to start with metro Halifax and work out from there. Is this possible?

I am a noob when it comes to Magellan products....just got the unit yesterday.

Thanks,

Blair Hammond