I bought an update card ( Gold) at a Defender discounted sale and its on my shelf. I want to wait until April 15 to actually activate it so I get two April updates for the price of one years subscription. ( April 15, 2015-April 1,2016).
I've never done this before my old chip was bought off the shelf in 2013 but I have CE on the PC at the Nav station which I really use for plotting and is updated ever Friday when wifi is available.