Lowrance Auto-Standby button Metal Addendum software release v20.2 for Zeus2 G - Page 10

Rejecting radar interference The Interference rejection (IR or Interf. rej.) option is used to eliminate second trace echoes from far distance targets, and the interference from radar units operating in the same frequency band. When the IR is ON, transceiver pulse staggering is enabled. When enabled, the transceiver PRF is changed slightly for each sweep. By doing this, spiral interferences and second trace echoes are split in range from sweep to sweep. The IR processing clears all the echoes found at the same range if they are not present in each sweep. The IR must be chosen according to the environment around own ship: • IR off when the maximum signal from the receiver is needed • IR on when the interference or second trace echoes disturb the radar image To avoid missing weak targets, the interference rejection should be set to OFF when no interference exists. Target separation Controls the target discrimination of the radar (separation between objects is more prominent). Fast scan Sets the speed of the radar antenna rotation. This option gives faster target updates. Ú Note: Maximum speed may not be achieved depending on the radar Settings, Mode, and Range selected. The radar will only rotate as fast as the current control settings allow. Target boost The target boost control increases pulse length or reduces radar bandwidth to make targets appear larger in range and increase radar sensitivity. More options Menu options can vary depending on your radar's capability. VelocityTrack Ú Note: When VelocityTrack is enabled antenna rotation speed may be reduced. Ú Note: When operating the radar in Dual range mode with one of the ranges set to 36 nm or more, increased VelocityTrack coloring noise over land areas may be seen. Doppler coloring is a navigation aid to distinguish moving targets approaching or diverging from your vessel. The radar indicates if a target is approaching or diverging from your vessel when both these conditions are true: • The target's relative speed is greater than the VelocityTrack speed threshold. • The target is not geo-stationary (e.g. land or a marker buoy). The following options are available: • Off - turns off Doppler coloring • Normal - approaching targets and diverging targets are colored. • Approaching targets - only approaching targets are colored The color of approaching and diverging targets depends on the palette used: • Diverging targets are blue colored on all radar image palettes. • Approaching target colors on radar image palettes: - Black/Red palette - Yellow - White/Red palette - Yellow - Black/Green palette - Red - Black/Yellow palette - Red VelocityTrack settings Use this dialog to set speed thresholds of targets to be colored. 10 ADDENDUM | Zeus Series