I just purchased the Dakota 20 and the new england topo sd card, hopefully they will arrive tomorow. What im wondering is if i was to purchase the city navigator north america to put directly on the garmin itself, instead of an sd card, is there enough room and will it bog down the device with the city nav on it and topo card at same time, cause it to go slower, etc. Also considering picking up the inland lakes if i can find a reasonable price on it. Product page says the dakota has 850mb of available memory.
Thanks.