Garmin GPSMAP 8700 Black Box Owners Manual - Page 43
Transmitting Radar Signals, Adjusting the Radar Range, MotionScope, Doppler Radar Technology,
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Transmitting Radar Signals NOTE: As a safety feature, the radar enters standby mode after it warms up. This gives you an opportunity to verify the area around the radar is clear before beginning radar transmission. 1 With the chartplotter off, connect your radar as described in the radar installation instructions. 2 Turn on the chartplotter. If necessary, the radar warms up and a countdown alerts you when the radar is ready. 3 Select Radar. 4 Select a radar mode. A countdown message appears while the radar is starting up. 5 Select Menu > Transmit Radar. Stopping the Transmission of Radar Signals From a radar screen, select Menu > Radar To Standby. TIP: Press > Radar To Standby from any screen to quickly stop radar transmission. Setting Up the Timed Transmit Mode To help conserve power, you can set up time intervals in which the radar will transmit and not transmit (standby) signal transmissions. NOTE: This feature is not available in dual radar modes. 1 From a radar screen, select Menu > Radar Options > Timed Transmit. 2 Select Timed Transmit to enable the option. 3 Select Stdby Time, enter the time interval between radar signal transmissions, and select Done. 4 Select Transmit Time, enter the duration of each radar signal transmission, and select Done. Enabling and Adjusting a Radar No Transmit Zone You can indicate areas within which the radar scanner does not transmit signals. NOTE: GMR Fantom and xHD2 radar models support two notransmit zones. Most other GMR radar models support one notransmit zone. GMR 18 HD+ radar models do not support notransmit zones. 1 From a radar screen, select Menu > Radar Setup > Installation > No Transmit Zone. The no-transmit zone is indicated by a shaded area on the radar screen. 2 Select Angle 1, and select the new location for the first angle. 3 Select Angle 2, and select the new location for the second angle. 4 Select Done. 5 If necessary, repeat for the second zone. Adjusting the Radar Range The range of the radar signal indicates the length of the pulsed signal transmitted and received by the radar. As the range increases, the radar transmits longer pulses in order to reach distant targets. Closer targets, especially rain and waves, also reflect the longer pulses, which can add noise to the Radar screen. Viewing information about longer-range targets can also decrease the amount of space available on the Radar screen for viewing information about shorter-range targets. • Select to decrease the range. • Select to increase the range. Tips for Selecting a Radar Range • Determine what information you need to see on the Radar screen. For example, do you need information about nearby weather conditions or targets and traffic, or are you more concerned about distant weather conditions? • Assess the environmental conditions where the radar is being used. Especially in inclement weather, longer-range radar signals can increase the clutter on the Radar screen and make it more difficult to view information about shorter-range targets. In rain, shorter-range radar signals can enable you to view information about nearby objects more effectively, if the rain clutter setting is configured optimally. • Select the shortest effective range, given your reason for using radar and the present environmental conditions. MotionScope™ Doppler Radar Technology The GMR Fantom radar uses the Doppler effect to detect and highlight moving targets to help you avoid potential collisions, find flocks of birds, and track weather formations. The Doppler effect is the frequency shift in the radar echo due to the relative motion of the target. This allows for instant detection of any targets moving toward or away from the radar. The MotionScope feature highlights the moving targets on the radar display so you can navigate around other boats or severe weather, or toward fishing spots where birds are feeding at the surface. The moving targets are color-coded so you can tell at a glance which targets are moving toward or away from you. On most color schemes, green indicates the target is moving away from you and red indicates the target is moving toward you. On some models, you can also adjust the M-Scope Sensitivity setting to change the speed threshold for target highlighting. A higher setting highlights slower targets, and a lower setting highlights only faster targets. Enabling a Guard Zone You can enable a guard zone to alert you when anything comes within a specified area around your boat. From a radar screen, select Menu > Radar Options > Guard Zone. Defining a Circular Guard Zone Before you can define the boundaries of the guard zone, you must enable a guard zone (Enabling a Guard Zone, page 35). You can define a circular guard zone that completely surrounds your boat. 1 From a radar screen, select Menu > Radar Options > Guard Zone > > Circle. 2 Select the location of the outer guard zone circle. 3 Select the location of the inner guard zone circle to define the width of the guard zone. Defining a Partial Guard Zone Before you can define the boundaries of the guard zone, you must enable a guard zone (Enabling a Guard Zone, page 35). You can define the boundaries of a guard zone that does not completely surround your boat. 1 From a radar screen, select Menu > Radar Options > Guard Zone > > Corner 1. Radar 35