You can use up to a 32GB card in your camera. When the ContourHD 1080p was first introduced, 32GB cards were not widely available. Since then the microSD card market has expanded and so your camera can use a 32GB card.
However, there is a small firmware glitch when using a card that size. The memory card light will alway indicate that the card is full by showing a red light anytime you check the card status. This is true even when the card is not full. Other than that, it will function normally.
This is ONLY true in the ContourHD 1080p. 32GB cards work without this error in the ContourGPS, Contour+, ContourROAM, Contour+2, and ContourROAM2 cameras.
The ContourHD 720p can only use cards up to 16GB in size.
For more about microSD card compatibility, see this link: