Garmin 740 S Owners Manual
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GPSMAP 700 Series Owner’s Manual 57 Radar Sentry Mode Sentry mode allows you to put the radar into timed-transmit mode, in which you can configure a radar transmit and standby cycle to conserve power. You can also enable a guard zone in this mode, which identifies a safe zone around your boat and sounds an alarm when a radar object enters this zone. Sentry mode works with all Garmin GMR model radars. Showing Sentry Mode From the Home screen, select Radar > Sentry. Enabling Timed Transmit From the Home screen, select Radar > Sentry > Menu > Sentry Setup > Timed Xmit > on. Setting the Standby and Transmit Times You must enable timed transmit before you can set the standby and transmit times ( page 57). To help conserve power, you can indicate the radar standby time and the transmit time to implement periodic radar signal transmissions at set intervals. 1. From the Home screen, select Radar > Sentry > Menu > Sentry Setup. 2. Select Stdby Time. 3. Enter the time interval between radar signal transmissions. 4. Select Done. 5. Select Xmit Time. 6. Enter the duration of each radar signal transmission. 7. Select Done. Enabling a Guard Zone From the Home screen, select Radar > Sentry > Menu > Sentry Setup > enable Guard Zone. Defining a Partial Guard Zone You must enable a guard zone before you can define the boundaries of the zone ( page 57). You can define the boundaries of a guard zone that does not completely encompass your boat. 1. From the Home screen, select Radar > Sentry > Menu > Sentry Setup > Adjust Guard Zone > Move Guard Zone > Corner 1. 2. Touch and drag the location of the outer guard-zone corner ( ). 3. Select Corner 2.
58 GPSMAP 700 Series Owner’s Manual Radar 4. Touch the location of the inner guard-zone corner. 5. Select Done. Defining a Circular Guard Zone You must enable a guard zone before you can define the boundaries of the zone ( page 57). You can define a circular guard zone that completely encompasses your boat. 1. From the Home screen, select Radar > Sentry > Menu > Sentry Setup > Adjust Guard Zone > Move Guard Zone > Circle . 2. Touch and drag the location of the outer guard-zone circle, ( ). 3. Select Corner 2. 4. Touch and drag the location of the inner guard-zone corner. 5. Select Circle. Setting the Safe-zone Collision Alarm See “Setting the Safe-zone Collision Alarm (page 15). Viewing a List of AIS Threats From any radar view or the Radar Overlay, you can view and customize the appearance of a list of AIS threats. 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, Sentry, or Radar overlay . 3. Select Menu > other Vessels > AIS List.
GPSMAP 700 Series Owner’s Manual 59 Radar Showing AIS Vessels on the Radar Screen AIS requires the use of an external AIS device and active transponder signals from other vessels. You can configure how other vessels appear on the Radar screen. If any setting (except the AIS display range) is configured for one radar mode, the setting is applied to every other radar mode. The details and projected heading settings configured for one radar mode are applied to every other radar mode and to the Radar Overlay. 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry. 3. Select Menu > other Vessels > AIS Display Setup . 4. Complete an action: • Select AIS Display Range to indicate the distance from your location within which AIS vessels appear, and select a distance. • Select Details > Show to show details about AIS-activated vessels. • Select Projected Heading , enter the projected heading time for AIS-activated vessels, and select Done. • Select Trails to show the tracks of AIS vessels, and select the length of the track that appears using a trail. VRM and EBL The variable range marker (VRM) and the electronic bearing line (EBL) measure the distance and bearing from your boat to a target object. On the Radar screen, the VRM appears as a circle that is centered on the present location of your boat, and the EBL appears as a line that begins at the present location of your boat and intersects the VRM. The point of intersection is the target of the VRM and the EBL. Showing the VRM and the EBL The VRM and the EBL configured for one mode are applied to all other radar modes. 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, or offshore. 3. Select Menu > Show VRM/eBL. Adjusting the VRM and the EBL You must show the VRM and the EBL before you can adjust them ( page 59). You can adjust the diameter of the VRM and the angle of the EBL, which moves the intersection point of the VRM and the EBL. The VRM and the EBL configured for one mode are applied to all other radar modes. 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, or offshore. 3. Select Menu > Adjust VRM/eBL > Move VRM/eBL. 4. Touch a new location for the intersection point of the VRM and the EBL. 5. Select Done. Measuring the Range and Bearing to a Target Object You must show the VRM and the EBL before you can adjust them ( page 59). The VRM and the EBL configured for one mode are applied to all other radar modes. 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, or offshore. 3. Select Menu > Adjust VRM/eBL > Move VRM/eBL. 4. Touch the target location. The range and the bearing to the target location appear in the upper-left corner of the screen. 5. Select Done.
60 GPSMAP 700 Series Owner’s Manual Radar Hiding the VRM and the EBL 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, or offshore. 3. Select Menu > Adjust VRM/eBL > Hide VRM/eBL. Measuring the Range and Bearing to a Target Object while VRM and EBL are Hidden If you have hidden VRM and EBL (page 60), you can quickly display the range and bearing to a location by touching the screen. 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, or offshore. 3. Touch a location. 4. Select Drop VRM/eBL. Measuring the Distance to a Point on the Radar Screen You can touch a point on the radar screen to display the distance and bearing of that location from your present location in the upper-left corner of the screen. 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, or offshore. 3. Touch a location on the screen. 4. Select Measure Distance. 5. If necessary, select Set Reference to measure from the selected location rather than your present location. Waypoints and Routes on the Radar Screen Marking a Waypoint on the Radar Screen 1. From the Home screen, select Radar. 2. Select a radar mode. 3. Touch a location. 4. Select Create Waypoint. Showing Waypoints on the Radar Screen You can show waypoints that are within the range shown on the Radar screen. This setting does not apply to the Radar Overlay. 1. From the Home screen, select Radar > Radar Setup > Appearance > Waypoints. 2. Complete an action: • Select Show to show all waypoints. • Select Navigation only to show only waypoints associated with the currently active route. Hiding Waypoints on the Radar Screen You can hide waypoints that are within the range shown on the Radar screen. From the Home screen, select Radar > Radar Setup > Appearance > Waypoints > Select Hide. Navigating a Saved Route on the Radar Screen Before you can browse a list of routes and navigate to one of them, you must record and save at least one route (page 28). Navigation lines must be showing in order to view a route on the Radar screen ( page 68). 1. From the Home screen, select Where To? > Routes. 2. Select a route. 3. Select Navigate To. 4. Complete an action: • Select Forward to navigate the route from the starting point used when the route was created. • Select Backward to navigate the route from the destination point used when the route was created. 5. From the Home screen, select Radar.
GPSMAP 700 Series Owner’s Manual 61 Radar 6. Select Cruising, Harbor, offshore, or Sentry. The route appears as a magenta line, with the starting point, the destination, and turns indicated. 7. Review the course indicated by the magenta line. 8. Follow the magenta line along each leg in the route, steering to avoid land, shallow water , and other obstacles. Navigating Parallel to a Saved Route on the Radar Screen Before you can browse a list of routes and navigate to one of them, you must record and save at least one route (page 28). Navigation lines must be showing in order to view a route on the Radar screen ( page 68). 1. From the Home screen, select Where To? > Routes. 2. Select a route. 3. Select Navigate To > offset. 4. Complete an action: • Select Forward - Port to navigate the route from the starting point used when the route was created, to the left of the original route. • Select Forward - Starboard to navigate the route from the starting point used when the route was created, to the right of the original route. • Select Backward - Port to navigate the route from the destination point used when the route was created, to the left of the original route. • Select Backward - Starboard to navigate the route from the destination point used when the route was created, to the right of the original route. 5. Enter the offset distance. 6. Select Done. 7. From the Home screen, select Radar. 8. Select Cruising, Harbor, offshore, or Sentry. The route appears as a magenta line, with the starting point, the destination, and turns indicated. 9. Review the course indicated by the magenta line. 10. Follow the magenta line along each leg in the route, steering to avoid land, shallow water , and other obstacles. About the Radar Overlay The Radar Overlay superimposes radar information on the Navigation chart or the Fishing chart. Data appears on the Radar Overlay based on the most-recently used radar mode (Cruising, Harbor , Offshore, or Sentry), and all settings configurations applied to the Radar Overlay are also applied to the last-used radar mode. For example, if you use Harbor mode and then you switch to the Radar Overlay , the Radar Overlay would show Harbor mode radar data. If you changed the gain setting using the Radar Overlay menu, the gain setting for Harbor mode would change automatically. Radar Overlay on the Navigation Chart
62 GPSMAP 700 Series Owner’s Manual Radar Radar Overlay and Chart Data Alignment When using the Radar Overlay, the chartplotter aligns radar data with chart data based on the boat heading, which is based by default on data from a magnetic heading sensor connected using a NMEA 0183 or NMEA 2000 network. If a heading sensor is not available, the boat heading is based on GPS tracking data. GPS tracking data indicates the direction in which the boat is moving, not the direction in which the boat is pointing. If the boat is drifting backward or sideways due to a current or wind, the Radar Overlay may not perfectly align with the chart data. This situation should be avoided by using boat-heading data from an electronic compass. If the boat heading is based on data from a magnetic heading sensor or an automatic pilot, the heading data could be compromised due to incorrect setup, mechanical malfunction, magnetic interference, or other factors. If the heading data is compromised, the Radar Overlay may not align perfectly with the chart data. Showing the Radar Overlay The Radar Overlay displays data based on the most-recently used radar mode. From the Home screen, select Radar > Radar overlay. The radar picture appears in orange and overlays the Navigation chart. Zooming In and Out on the Radar Overlay Zooming while panning the map only affects the zoom scale of the map. The radar range remains the same. Zooming while the map is locked on the boat (not panning) affects the zoom scale of the map and the radar range. Touch the and buttons to zoom out and zoom in. Optimizing the Radar Display You can optimize the radar display for each radar mode. 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry. 3. Select a radar range ( page 62). 4. Restore the default value of the gain setting ( page 63). 5. Restore the default value of the sea clutter setting ( page 64). 6. Restore the default value of the rain clutter setting (page 65). 7. Restore the default value of the FTC setting ( page 65). 8. Restore the default value of the crosstalk setting ( page 66). 9. Adjust the gain setting manually ( page 64). 10. Adjust the sea clutter setting manually ( page 65). 11. Adjust the rain clutter and FTC settings manually ( page 65). About the Range of Radar Signals 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 tar gets. 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.
GPSMAP 700 Series Owner’s Manual 63 Radar Tips for Selecting a Radar Range • Determine what information you need to see on the radar display. 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 in which 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 and FTC settings are configured optimally. • Select the shortest effective range, given your reason for using radar and the present environmental conditions. Selecting a Radar Range See “Adjusting the Zoom Scale on the Radar Screen” ( page 54). About Gain and Clutter The gain controls the sensitivity of the radar receiver. The default setting for the gain, Auto, sets the gain automatically one time, based on average conditions, the range of the radar signal, and the selected radar mode. The chartplotter does not readjust the gain automatically in response to changing conditions. To optimize the radar appearance for specific conditions, manually adjust the gain ( page 64). Clutter is interference caused by the unwanted reflection of radar signals of f of unimportant targets. Common sources of clutter include precipitation, sea waves, and nearby radar sources. Settings Configurations and Radar Type When using a GMR 20, 21, 40, 41, 18, 18 HD, 24, 24 HD, 404, or 406, all gain and clutter settings configured for use in one radar mode are applied to every other radar mode and to the Radar Overlay . When using a GMR 604 xHD, 606 xHD, 1204 xHD, or 1206 xHD radar, the gain, FTC, rain clutter, and sea clutter settings configured for use in one radar mode must be configured separately for each mode. Crosstalk settings configured for use in one mode are applied to every other radar mode. The last gain and clutter settings configured for use in any radar mode are applied to the Radar Overlay automatically . For example, if the gain for the Harbor mode is set to 50%, the gain for the Radar Overlay is set to 50% automatically . Later, if the gain for the Offshore mode is set to 40%, the gain for the Radar Overlay is set to 40% automatically. Default Gain and Clutter Settings Setting Default Value Instructions Gain Auto See “Automatically Adjusting Gain on the Radar Screen” (page 63). Sea Clutter Calm, Medium, or Rough See “Restoring the Default Sea Clutter Setting” (page 64). Rain Clutter Off See “Restoring the Default Rain Clutter Setting” (page 65). FTC Off See “Restoring the Default FTC Setting” (page 65) Crosstalk On See “Adjusting Crosstalk Clutter on the Radar Screen” (page 66). Automatically Adjusting Gain on the Radar Screen Auto is the default value for the gain setting. The automatic gain setting for each radar mode is optimized for that mode, and may differ from the automatic gain setting used for another mode. NoTe: Depending upon the radar in use, the gain setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay ( page 63). 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Gain > Auto. The chartplotter sets the gain automatically once based on average conditions, the range of the radar signal, and the selected radar mode. The chartplotter does not readjust the gain automatically in response to changing conditions.
64 GPSMAP 700 Series Owner’s Manual Radar Manually Adjusting Gain on the Radar Screen For optimal radar performance that accounts for actual conditions, you can manually adjust the gain. NoTe: Depending upon the radar in use, the gain setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay (page 63). 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Gain. 4. Select Up to raise the gain, until light speckles appear across the Radar screen. Data on the Radar screen is refreshed every few seconds. As a result, the effects of manually adjusting the gain may not appear instantly. Adjust the gain slowly. 5. Select Down to lower the gain until the speckles disappear. 6. If boats, land, or other targets are within range, select Down to lower the gain until the targets begin to blink. 7. Select Up to raise the gain until the boats, land, or other targets appear steadily lit on the Radar screen. 8. If necessary, minimize the appearance of nearby large objects ( page 64). 9. If necessary, minimize the appearance of side-lobe echoes ( page 64). Minimizing Nearby Large-object Interference Nearby targets of significant size, such as jetty walls, can cause a very bright image of the target to appear on the Radar screen. This image can obscure smaller targets located near it. NoTe: Depending upon the radar in use, the gain setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay ( page 63). 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Gain. 4. Select Down to lower the gain until the smaller targets are clearly visible on the Radar screen. Reducing the gain to eliminate nearby large-object interference may cause smaller or more-distant targets to blink or disappear from the Radar screen. Minimizing Side-lobe Interference on the Radar Screen Side-lobe interference may appear to streak outward from a target in a semi-circular pattern. Side-lobe effects can be avoided by reducing the gain or reducing the radar range. NoTe: Depending upon the radar in use, the gain setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay ( page 63). 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Gain. 4. Select Down to lower the gain until the semi-circular, streaked pattern disappears from the Radar screen. Reducing the gain to eliminate side-lobe interference may cause smaller or more-distant tar gets to blink or disappear from the Radar screen. Restoring the Default Sea Clutter Setting NoTe: Depending upon the radar in use, the sea clutter setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay ( page 63). 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Noise Rejection > Sea Clutter > Presets. 4. Select a setting that reflects present sea conditions: Rough, Medium, or Calm.
GPSMAP 700 Series Owner’s Manual 65 Radar Adjusting Sea Clutter on the Radar Screen You can adjust the appearance of clutter caused by choppy sea conditions. The sea clutter setting affects the appearance of nearby clutter and targets more than it affects the appearance of distant clutter and targets. A higher sea clutter setting reduces the appearance of clutter caused by nearby waves, but it can also reduce or eliminate the appearance of nearby targets. NoTe: Depending upon the radar in use, the sea clutter setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay (page 63). 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Noise Rejection > Sea Clutter > Presets. 4. Select a setting that reflects present sea conditions: Rough, Medium, or Calm. 5. Select Menu > Noise Rejection > Sea Clutter. 6. Select Up or Down to decrease or increase the appearance of sea clutter until other tar gets are clearly visible on the Radar screen. Clutter caused by sea conditions may still be visible. Restoring the Default FTC Setting NoTe: Depending upon the radar in use, the FTC setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay ( page 63). 1. From the Home screen, select Radar. 2. Select Harbor, offshore, or Sentry mode. 3. Select Menu > Noise Rejection > FTC > off. Restoring the Default Rain Clutter Setting NoTe: Depending upon the radar in use, the rain clutter setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay ( page 63). 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Noise Rejection > Rain Clutter > off. Adjusting Rain Clutter on the Radar Screen You can adjust the appearance of clutter caused by rain. Reducing the radar range also can minimize rain clutter ( page 54). Setting Description FTC This setting affects the appearance of large, hazy masses of clutter caused by rain at any distance. Rain Clutter This setting affects the appearance of nearby rain clutter and targets more than it affects the appearance of distant rain clutter and targets. A higher rain clutter setting reduces the appearance of clutter caused by nearby rain, but it can also reduce or eliminate the appearance of nearby targets. NoTe: Depending upon the radar in use, the rain clutter and FTC settings configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay ( page 63). 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Noise Rejection > FTC.
66 GPSMAP 700 Series Owner’s Manual Radar 4. Complete an action: • Select High, Medium, or Low to decrease or increase the appearance of rain clutter, if using a GMR 20, 21, 40, 41, 18, 18 HD, 24, 24 HD, 404, or 406 radar. Other targets should remain clearly visible on the Radar screen. • Select Up or Down to decrease or increase the appearance of rain clutter, if using a GMR 604 xHD, 606 xHD, 1204 xHD, or 1206 xHD radar. Other targets should remain clearly visible on the Radar screen. If the FTC setting is greater than 50%, consider reducing the radar range. 5. Select Menu > Noise Rejection > Rain Clutter. 6. Select Up or Down to decrease or increase the appearance of nearby rain clutter until other tar gets are clearly visible on the Radar screen. Clutter caused by rain may still be visible. Adjusting Crosstalk Clutter on the Radar Screen You can reduce the appearance of clutter caused by interference from another nearby radar source. On is the default value for the crosstalk setting. NoTe: Depending upon the radar in use, the crosstalk setting configured for use in one radar mode may or may not be applied to other radar modes or to the Radar Overlay ( page 63). 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Noise Rejection > Crosstlk > on. Radar Display Appearance Radar Overlay Numbers Overlay numbers with data fields ➊ can appear on all radar modes, and they provide real-time, at-a-glance information. All data bars configured for use in one radar mode appear in every other radar mode. All data bars configured for use on the Radar Overlay appear only on the Radar Overlay , and must be configured separately. Several radar data overlays are available. You can select the data fields to be shown within each data overlay. When overlay numbers are displayed on the radar screen, the navigation inset ➋ is shown during navigation. The compass tape ➌ can be shown or hidden in each overlay. Radar with Data Overlay ➊➋ ➌ Selecting a Data Overlay 1. From the Home screen, select Radar. 2. Select Cruising, Harbor, offshore, or Sentry mode. 3. Select Menu > Radar Setup > overlay Numbers. 4. Select or to select a data overlay.