1.Dashboard

This is default gauges view where equipment operator can watch important real-time information like oil temperature, fuel level and important canbus system states. Top part is system status messsages-icons and engine hours that are always visible on every screen no matter what. Icons have pre-defined set for each equipment type with null state visible to let operator be familiar with their placement so he can be sure that it's not hidden and he can miss something.

2. Settings Menu

Settings are the horizontal list with highlight selection and confirmation button. It basically consists of ISO icon riddles of what operator can set.

3. Settings / Security Settings

Here is notable how structure works in this system: every list is horizontal with icon of directory being a header. There is no "back button" and there is only one set of navigation language with X to close this level of menu. It was done to limit the similarities between same mental image of left-right arrows and another type of arrow that is placed in another spot. "Is that arrow to jump to the start of the list?"

4. Slider

We decided to have a slider with pre-defined 5 steps for speed. Unit doesn't have brightness sensor so sometimes it's important to have some adjustment made quickly.

This control was a part of different set of controls I designed with the function-adjustment matrix with accessibility in mind.

5. Service Interval View

For some cases riddles are basically infographics representing in this example service intervals with remaining hours visible. The confusing format of minus-number was chosen because it is current system language and folks are familiar with it.   

6. Testing Interactions

Sliders, radio-buttons, switchers: we had it all. But we chose wisely how to make a specific selection with accessibility in mind and common logic, convenience vs. minimising errors, etc.

7. Skins

When we figure out the flow and process I made a few variants of how it could look. The final decision was made to balance readability on not-great-screen sprayed with dust on a sunny day. Its was fun process to play with skeuomorphism like in old times.