Is it required to keep the update card for BlueChart g2/g3 mapping in my device?

When updating the preloaded BlueChart g2/g3 mapping on a Garmin marine device, you may be given the option to copy the update to the device. Once you have done this, the internal mapping will then be up to date and the card can be removed. Some devices do not have enough internal memory to install the update and will not give you the option to copy it. If you do not get this option when you insert the update card, it will be necessary to keep the card in device in order to see the updated map information.