Lowrance HDS-7 LIVE HDS Live Operator Manual - Page 139
Course up, Offsetting the PPI center
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The North up orientation is not available if no heading source is connected to the radar. If heading data is lost, the system will automatically switch to Head-up orientation. Course up In Course up mode, the top of the bearing scale indicates the ship's true course measured from north at the time Course up was activated. When the ship turns the bearing scale remains fixed, while the heading line rotates with the ship's yawing and course change. The Course up orientation is reset by re-selecting the Course up mode. Offsetting the PPI center You can set the antenna position origin to different location on the radar PPI. The options described in the next sections are available. Ú Note: Offsetting the PPI center is allowed only in Relative motion. PPI center: Center PPI center: Look Ahead PPI Center: Offset You return the antenna center to PPI center by using the offset option in the View menu. Ú Note: The bearing scale is according to the Consistent Common Reference Point (CCRP), while the offset sets the radar antenna position on the PPI. The maximum off-centering allowed is 75% of the radius at the current range. This may result in the CCRP being outside of the bearing scale. In such cases the measurements are still taken by the CCRP and the bearing scale is compressed accordingly. Radar| HDS Live Operator Manual 139