GMDSS Maintainer: Element 9

1. A To measure the difference between L-1 and L-2 signals and transmit the information via the GPS signal.
2. B To correct for time errors in the satellites and transmit this information via the GPS signal.
3. C To correct for various errors using a fixed receiving station which transmits corrections via radio signals.
4. D To correct for phase errors between L-1 and L-2 signals and transmit the information via radio beacons.

Tip: press A-D to answer