The Ultra is a dive watch, but not a dive computer. It has a depth gauge but none of the algorithms necessary to compute required dive times. For that, and they

The Ultra is a dive watch, but not a dive computer. It has a depth gauge but none of the algorithms necessary to compute required dive times. For that, and they admit this, you will need an app on your iPhone. The headline is correct, however, because in the future, all that a diver will need is a software app, with an Apple watch and iPhone, and not a $1,000 plus piece of dedicated hardware.