Jacal is this on pc or mac. as above, Does the mac/pc see the Nav 5, does express see the Nav 5, does the mac/pc see the card, can you write to the card from the mac/pc while it is onboard the Nav 5, can you write to the card using a card reader. has the map update downloaded to the mac/pc ok, and is it working as it should (you can use basecamp). has this update been put on the unit before via a different card, and as above are you sure the usb cable is correct and working, and how big is the card.

