Furuno NAVnet 1722C, Operator'S Manual, Page: 10 / 33

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4.5 Measuring Depth, Range .........................................................................................................4-11
4.5.1 Measuring depth with the VRM..........................................................................................4-11
4.5.2 Measuring depth, range with the cross-hair cursor............................................................4-11
4.6 Reducing Interference............................................................................................................. 4-12
4.7 Reducing Low Level Noise...................................................................................................... 4-13
4.8 Erasing Weak Echoes (GP/GD-1700C) .................................................................................. 4-14
4.9 White Marker (GP/GD-1700C) ................................................................................................ 4-15
4.10 Picture Advance Speed ......................................................................................................... 4-16
4.10.1 Advancement independent of ship’s speed .................................................................... 4-16
4.10.2 Advancement synchronized with ship’s speed ............................................................... 4-17
4.11 Display Colors (GP/GD-1700C) ............................................................................................ 4-18
4.12 Alarms ................................................................................................................................... 4-19
4.12.1 Audio alarm on/off ........................................................................................................... 4-19
4.12.2 Bottom alarm................................................................................................................... 4-20
4.12.3 Fish (B/L) alarm............................................................................................................... 4-20
4.12.4 Fish (normal) alarm ......................................................................................................... 4-21
4.12.5 Water temperature alarm ................................................................................................ 4-21
4.12.6 When an alarm setting is violated... ................................................................................ 4-22
4.13 Water Temperature Graph..................................................................................................... 4-23
4.14Interpreting the Sounder Display............................................................................................ 4-24
4.14.1 Zero line .......................................................................................................................... 4-24
4.14.2 Bottom echo .................................................................................................................... 4-24
4.14.3 Fish school echoes ......................................................................................................... 4-25
4.14.4 Surface noise/Aeration.................................................................................................... 4-25