What does the signal "L1210" indicate?

The signal "L1210" indicates latitude of 12 degrees 10 minutes. In maritime communication, signals often utilize a coded system where specific letters represent different types of information. The letter "L" is commonly used to signify latitude in navigational contexts. Therefore, when you see "L1210," it is understood as referring explicitly to latitude measurements. Understanding this coding is essential for navigation and communication at sea, especially for mariners who need to convey precise positional information quickly and efficiently.

With respect to other choices presented, while they may seem plausible, they either reflect concepts that have different coding or do not align with maritime signaling conventions used for navigation.