Flat card

Conical or cylindrical card

A flat card is read on the back edge, where the lubberline is located. The fluid magnifies the numerals which become easier to read. In addition, the flat card provides a global view of the card and its North point in relation to the boat's direction.

Reading from the front and the top of the card. In addition to front reading, this type of card usually features numerals and cardinal points on the top part of the card, thus providing two reading possibilities. This card is particularly suitable when steering or piloting is done sitting or standing.