If you add an amphibious assault vehicle to a stack, will the whole stack be able to enter ship mode anywhere?

Lets say I have 1 regular motorized infantry and add an amphibious assault vehicle to that 1 motorized infantry. After that I send the stack to an island nation such as New Zealand, will the motorized infantry go onto the water with the amphibious assault vehicle or would it have to go to a city to enter boat mode?