Which three pieces of information are found on the inside of a compass?

The correct choice identifies three important pieces of information typically found on the inside of a compass—variation, the date of the chart, and annual increase.

Variation refers to the difference between magnetic north and true north. It's crucial for accurate navigation because it allows the navigator to adjust their course to account for this discrepancy. The date of the chart is important because navigational charts can become outdated, and knowing the last update ensures that navigators make decisions based on the most current information. Annual increase, also known as magnetic declination, refers to the expected yearly change in the magnetic variation, which is essential for keeping navigation accurate over time, as magnetic north shifts gradually.

The other options include information that, while useful in different contexts, is not typically found on the inside of a compass. For instance, the compass type and magnetic north are fundamental concepts related to compasses and navigation but are not printed on a compass. Similarly, geographical location and vessel size are relevant to navigation and operations but are not elements associated directly with compass operation or construction.