Lowrance Radar Operation Instruction Manual page 53

In fig. 3, note the target off the bow approaching at high speed from the
north. The "dotted" trail indicates higher speed than targets with more
solid trails. Be alert; this boat is a collision risk.
Echo Trails fig. 3. Elapsed time = 8 seconds.
T1
T2
T5
T4
T3
Echo Trails fig. 4. Elapsed time = 12 seconds. Target 5 veered by your
starboard side and is now astern. Targets 1-4 reached port or left the area.
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