Simply enter your shift start date and select one of the preset rotas and your away.
Add in holidays and custom shift tiles for flight times etc.
The only app like this on the app store and you will not be disappointed as I work offshore and had this designed by asking colleagues what they wanted.

A continuously unbroken scrolling calendar makes it easy to view your upcoming shifts and also add friends rotas as well so that you can organize stag/hen parties or just a party to ensure that you are home at the same time

Manually add overtime shifts

We also threw in some firebrigade shift markers

All of this in the clearest, most attractive layout in the play store