You'll first want to clone the repo and install the dependencies as below (i'm using yarn)

yarn install

Next, add a .env file to the root of the project with the below key

REACT_APP_GEOLLECT_API_KEY=YOUR_KEY_HERE

lastly run the below command

yarn start

1. In the top-left of the app, there is a key to show/hide different types of vessel.
2. On press of a ship, an information window opens in the top right.
3. In the aforementioned information window, there is an option to show vessel history.

1. Making the app responsive to fit smaller screen sizes.
2. Display markers with more information for historic ship positions, every X amount of hours or perhaps one per day.
3. I chose to only load historic ship positions when requested, this cuts down on initial load time, but the user must then wait when historic data is requested. I would explore loading on app open just to compare speeds.
4. If I could change the backend, I would elect to return the ship information with the call to /vessels/positions, this would speed up the initial load time and cut down on API requests.