USCG-RADAR-L3.3

Worked plot 2: a crossing target and the ARPA cross-check

USCG-RADAR-M3 · Relative Motion Plotting · USCG-RADAR-M3-A The e-r-m method and two worked plots, from CPA and TCPA to avoiding action and ARPA checks.

A slow target with a **slowly drawing bearing** at long range. The plot shows why Rule 7(d)(ii) exists, and how to check an ARPA display with your own numbers.

AI-drafted catalogue content pending SME review. Radar Observer renewal by sea service depends on the NMC accepting that the position routinely used radar, and the carriage rule turns on inspected status and GRT; verify with the National Maritime Center and your approved course provider before relying on either.