139
3.3.24 Locking a fixed target on the radar PPI screen while the ship is navigating······················194
Commencing True Motion display ·································································································194
Canceling true motion display ········································································································195
3.3.25 Monitoring the motion of other ships (Targets)····································································197
1. Radar display of wake···············································································································197
Commencing radar display of a wake······················································································197
Ending radar display of a wake ································································································197
2. Using the lookout alarm ············································································································197
Setting the guard zone··············································································································197
Changing the alarm mode ········································································································199
Eradicating the guard zone·······································································································199
Calling a guard zone ·················································································································199
Changing the sensitivity of the alarm ·······················································································199
3.4 Other Convenient Functions·········································································································200
3.4.1 Displaying the ship's speed on the display unit ···································································200
3.4.2 Displaying the ship's heading on the display unit ································································200
3.4.3 Displaying position information (latitude/longitude, LORAN C time difference)
of the ship and waypoint information (latitude/longitude)·····················································201
Display of position information··································································································201
Erasing location information ·····································································································201
3.4.4 Displaying the waypoint ········································································································202
Display of the waypoint ·············································································································202
Erasing the waypoint·················································································································202
3.5 Miscellaneous Considerations······································································································203
3.5.1 Replacing the battery (BT1)··································································································203
3.5.2 In cases of abnormality during operations ···········································································204
3.6 External Navigation Devices·········································································································205
3.6.1 Obtaining information on bearing ·························································································205
3.6.2 Obtaining information on speed····························································································205
3.6.3 Obtaining information on position·························································································205
3.6.4 Obtaining information on distance to the waypoint······························································206
Chapter 4 How to Interpret the PPI Screen ······························ 207
4.1 Height of and the Distance to the Target ·····················································································207
4.2 Returns from a Target ···················································································································208
4.3 Propagation Path of Radio Waves ·······························································································208
4.3.1 Sea returns ····························································································································209
4.3.2 False echoes ·························································································································209
4.4 Display of Radar Transponder······································································································211
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