Lowrance electronic 988-0161-011 - Manual (Page 47)

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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.
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.
T5
T1
T2
T3
T4