User manual RAYMARINE RAYTECH RNS VERSION 5.0

[. . . ] RayTech RNS V5. 0 User Manual Document Number: 81216_2 Date: May 2004 Trademarks and registered trademarks Autohelm, HSB, Raymarine, RayTech, RayTech RNS, Sail Pilot, SeaTalk and Sportpilot are registered trademarks of Raymarine Limited. Apelco is a registered trademark of Raymarine Holdings Limited (Registered in all major marketing territories). AST, Autoadapt, Auto GST, Autoseastate, Autotrim, Bidata, Marine Intelligence, Maxiview, On Board, Raychart, Raynav, Raypilot, Raystar, ST40, ST60, Seaclutter, Smart Route, Tridata and Waypoint Navigation are trademarks of Raymarine Limited. Windows and NT are registered trademarks of Microsoft Inc. [. . . ] Use the BACK button to return to the top level softkeys. How do I acquire MARPA targets? You can acquire up to ten targets, which are then automatically tracked by the MARPA system. The are two ways in which a MARPA target can be acquired. Move the cursor over the target you want to acquire and click. The target acquired symbol will appear at the cursor's position, and the radar will search for a target in the location. If a target is present for several scans, the radar 58 RayTech RNS V5. 0 - User's Manual locks on to it and the safe target symbol appears. The target ID number appears at the safe target symbol. The own vessel safe zone is also displayed. Repeat Steps 1 through 3 for each target you want to acquire. Move the cursor over the target you want to acquire. Right click to display the right-click menu. The target acquired symbol will appear at the cursor's position, and the radar will search for a target in the location. If a target is present for several scans, the radar locks on to it and the safe target symbol appears. The target ID number appears at the safe target symbol. The own vessel safe zone is also displayed. Repeat Steps 1 through 4 for each target you want to acquire. How do I cancel a MARPA target? There are two ways in which a MARPA target can be cancelled. Move the cursor over the target you want to cancel and click. The target symbol and ID will disappear from the screen and the target is cancelled. Repeat Steps 1 and 2 for each target you want to cancel. Move the cursor over the target you want to cancel. Right click to display the right-click menu. The target is cancelled. Chapter 7: Using radar 59 How do I view MARPA target data? D6993_1 To view the MARPA database list: 1. The MARPA database list is now displayed. [. . . ] The lower the frequency, the broader the mark. Factors that can impair an image Although weaker than bottom or other echoes, your sonar picture may be impaired by echoes received from floating or submerged debris, air bubbles or even your boats movement. This is known as `background noise `or `clutter' and is controlled by the gain 129 modes (gain, color gain and TVG). Raymarine recommends that you allow your system to automatically control the ideal sensitivity level based on depth and water conditions. You can however adjust these settings manually if you prefer. Range and shift values By default, the sonar automatically adjusts the display depth range, selecting the shallowest range that keeps the bottom in the lower half of the display window. [. . . ]