Appendix B: Radar
143
Standard range scales
*The maximum range depends on scanner type.
The number of range rings shown in the table is the number to the selected range.
Additional range rings are displayed to the edge of the radar picture, at the
standard ring interval for the current range, and are visible when the center is
offset.
Interpreting the radar picture
Navigational echoes may be large, small bright or faint, depending not only on
the size of the object but also on its orientation and surface. Different objects
reflect the radar signals in different ways. For example, vertical objects such as
cliffs reflect signals better than sloping ones such as sandbanks.
High coastlines and mountainous coastal regions can be observed at the longest
radar range. However, the first sight of land may be a mountain several miles
inland from the coastline. The actual coastline may not appear on the radar until
the boat is close to the line of sight distance.
The radar indication may not be similar to your visual observation; a nearby small
object may appear to be the same size as a distant large object on the radar.
Standard ranges that can be selected are shown in the following table:
Maximum range
(nm)
Number of range
rings (nm)
Range ring interval
(nm)
0.125
2
0.0625
0.25
2
0.125
0.5
4
0.125
0.75
3
0.25
1.5
6
0.25
3
6
0.5
6
6
1
12
6
2
24*
6
4
48*
6
8
72*
6
12
81238_1.book Page 143 Thursday, September 16, 2004 2:49 PM
Summary of Contents for H6
Page 56: ...42 Raymarine H6 Owner s Manual 81238_1 book Page 42 Thursday September 16 2004 2 49 PM...
Page 66: ...52 Raymarine H6 Owner s Manual 81238_1 book Page 52 Thursday September 16 2004 2 49 PM...
Page 88: ...74 Raymarine H6 Owner s Manual 81238_1 book Page 74 Thursday September 16 2004 2 49 PM...
Page 102: ...88 Raymarine H6 Owner s Manual 81238_1 book Page 88 Thursday September 16 2004 2 49 PM...
Page 106: ...92 Raymarine H6 Owner s Manual 81238_1 book Page 92 Thursday September 16 2004 2 49 PM...
Page 114: ...100 Raymarine H6 Owner s Manual 81238_1 book Page 100 Thursday September 16 2004 2 49 PM...
Page 120: ...106 Raymarine H6 Owner s Manual 81238_1 book Page 106 Thursday September 16 2004 2 49 PM...
Page 132: ...118 Raymarine H6 Owner s Manual 81238_1 book Page 118 Thursday September 16 2004 2 49 PM...
Page 146: ...132 Raymarine H6 Owner s Manual 81238_1 book Page 132 Thursday September 16 2004 2 49 PM...
Page 162: ...148 Raymarine H6 Owner s Manual 81238_1 book Page 148 Thursday September 16 2004 2 49 PM...
Page 178: ...164 Raymarine H6 Owner s Manual 81238_1 book Page 164 Thursday September 16 2004 2 49 PM...
Page 182: ...168 Raymarine H6 Owner s Manual 81238_1 book Page 168 Thursday September 16 2004 2 49 PM...
Page 192: ...178 Raymarine H6 Owner s Manual 81238_1 book Page 178 Thursday September 16 2004 2 49 PM...