Which signal indicates a position at the latitude of 12 degrees only?

The signal that indicates a position specifically at the latitude of 12 degrees is represented by L1200. This coding system typically uses a combination of letters and numbers where the first part, "L12," specifies a latitude position, and "00" indicates that it is precisely at the 12 degrees latitude line.

In this context, the two zeros after L12 denote that there is no deviation north or south from the latitude line of 12 degrees. This systematic approach helps users understand geographic locations quickly, especially in navigational contexts such as maritime operations.

In contrast, the other options represent similar signals, but they indicate different latitudes. For instance, L1210 would indicate a position at 12 degrees, but offset to a longitude of 10 degrees, making it no longer strictly at the latitude of 12 degrees. Similarly, L1230 and L1240 would indicate positions at 12 degrees latitude but associated with longitudes of 30 and 40 degrees respectively, not aligning with the specific requirement of being solely at the latitude of 12 degrees.