First, I explored a few different options to find the right look and feel.
I landed on an interface that uses clean layouts, moderately skeuomorphic details and bright interactive colors.
The fleet-mapping tool was an interesting challenge: I had to make a living, utilitarian map—with lots of controls and content—look pretty and uncluttered.
I used Google's Styled Maps Wizard to manually choose colors for various standard map features.
Then, I recorded the winning colors in a JSON file to hand over to the map developers.
The final deliverable had over a hundred screens. The client was happy with the results.