inputs.text: garmin blue chart g2 sd card - great addition garmin devicesgarmin not really tell people actually topo city nav g2 blue charts hand held devicesthis area lots explorer city nav get topo explorer g2 blue charts boat kayak waterwayseasiest way know buy device topo pre installed transfer city nav internal mehemory via usb pop g2 blue chart sd cardof course combination maps one must loaded 1 3 waysworks flawlessly garmin montana 600t gpsmap 62t