SC00 is supported in the flight planner. Since this is a private use airport, you need to configure the search settings correctly in order to use private use airports in route planning. By default, these settings are turned off in order to minimize the number of search results.
There are two separate places that you can enable Private/Low Use Airports:
1. New Route Window
When planning a new route using the New Route window, uncheck the box at the top that says "public use airports only" as shown by the red arrow in the screenshot below. With this unchecked, the departure and destination search boxes will find SC00.
2. Chart Search Box
In the upper right corner of the screen, there is a search box. This allows you to search for waypoints and airports. Next to the Go button is a small down arrow. Select this arrow to reveal a list of options that you can enable for the search. Click on "Low Use Airports" so that there is a white outline around the option. Then you will be able to search for low use/private airports. See red arrow in the screenshot below.
Each of these options only needs to be selected once. They will be remembered each time you use the flight planner. If however, your search results become too large when search for public use airports, you can re-enable these filters to reduce the result list.
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