MAINSAIL is an example of which CALLSIGN TYPE?

• A. Collective
• B. Ground
• C. Administrative
• D. Tactical

Answer: (A)

The concept being tested is how radiotelephony callsigns are categorized by function. A collective callsign is used to address a formation or organization made up of multiple units, so one callsign can control the whole group and orders apply to everyone in that formation. MAINSAIL fits this because it would serve as the shared address for the group, not for a single vessel or a fixed location. In contrast, a ground callsign refers to a fixed station on land, an administrative callsign is for non-operational or personnel traffic, and a tactical callsign is used for direct, on-scene mission control. So MAINSAIL is best described as a collective callsign because it represents and commands a group as a unit.