- Picture smudges in azimuth. During alterations of course.
- Because of smudging, accurate bearing cannot be taken during large co alteration.
- Plotting became highly inaccurate during yow in bad weather as ships heads changing several degrees per sec, resulting in severe smudging.
- All bearings are relative.
- Time wasted in conversion of relative bearing into true bearings.
- Chances of electrical error in conversion from relative to true bearings.
- Radar picture is head up where as the chart is north up.
- After large alterations of course observer tends to get disoriented with plotting as all targets have shifted to the new relative bearing on the radar screen.
- No indication, on PPI of gyro Course steered. Temporary alterations or wandering off course can remain forgetter unless the compass repeater or Course recorder is inspected.
- ARPA cannot be used.
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- Picture does not smudge during alteration of co.
- Baring can be taken accurately, even during large alterations of course.
- Plotting accuracy unaffected by yaw.
- All bearings are true.
- No such time lost as true bearings are directly obtained.
- No such chances of electrical error as true bearings are directly obtained.
- Both being north up, easier comparison with the chart.
- No such disorientation as all targets remain on their true bearings on the radar screen, despite large alterations of course.
- Heading marker indicates at all times, the gyro course steered. Every time the observer inspects the radar screen, the Course Steered gets checked by him.
- ARPA can be used.
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