GMDSS: Element 7R

1. A Typically 50-100 nautical miles (90-180 km) from shore.
2. B Typically 200-400 nautical miles (360-720 km).
3. C Typically upwards of 1000 nautical miles (1800 km) during the daytime.
4. D It is limited to line-of-sight or about 30 nautical miles (54 km).

Tip: press A-D to answer