Having your boat card's printed means you a very handy item to hand out. We had ours printed via Vista Print and got 250 to start with for $18 delivered. We did find it confusing on exactly what was too much information and what was not enough - we ended up with this:
We went hot and cold on whether or not to put our mobile number on the card as once we hit Asian waters we weren't going to be using our Australian mobile number any more. So we decided to leave a space where were could write the number on directly once we had the new sim card & number overseas.
The back of card is blank and both sides have a white background.