12. NAVIGATION TOOLS
12-5
12.3
Look-ahead
[Look-ahead] sets the area ahead and around own ship for which to check for safe
navigation. See section 8.2 for how to activate own ship check.
12.4
Ring
The range rings are the concentric set of rings on the ECDIS display. They provide an
estimation of the range to an object. You can turn them on or off from the [Ring] page.
The interval between rings changes with the chart scale as shown in the table below.
Chart scale
Ring interval (nm)
Chart scale
Ring interval (nm)
1:1,000
0.025
1:100,000
2.0
1:2,000
0.05
1:200,000
4.0
1:5,000
0.10
1:500,000
8.0
1:10,000
0.25
1:1,000,000
16.0
1:20,000
0.5
1:2,000,000
20.0
1:50,000
1.0
Range
ring
Summary of Contents for FMD3100
Page 36: ...1 INTRODUCTION 1 20 This page is intentionally left blank ...
Page 70: ...2 OPERATIONAL OVERVIEW 2 34 This page is intentionally left blank ...
Page 128: ...5 VECTOR S57 CHARTS 5 12 This page is intentionally left blank ...
Page 140: ...7 C MAP BY JEPESSEN CHARTS 7 6 This page is intentionally left blank ...
Page 206: ...11 HOW TO MONITOR ROUTES 11 16 This page is intentionally left blank ...
Page 230: ...13 TRACKED TARGET TT FUNCTIONS 13 10 This page is intentionally left blank ...
Page 244: ...14 AIS TARGET FUNCTIONS 14 14 This page is intentionally left blank ...
Page 250: ...15 AIS SAFETY NAVTEX MESSAGES 15 6 This page is intentionally left blank ...
Page 294: ...19 RECORDING FUNCTIONS PLAYBACK FUNCTIONS 19 14 This page is intentionally left blank ...
Page 312: ...20 ALERTS 20 18 This page is intentionally left blank ...
Page 332: ...22 SETTINGS MENU 22 16 This page is intentionally left blank ...
Page 338: ...23 MAINTENANCE AND TROUBLESHOOTING 23 6 This page is intentionally left blank ...
Page 395: ......