Garmin GPSMAP 546 Owner's Manual
  1. Manuals
  2. Brands
  3. Garmin Manuals
  4. Marine GPS System
  5. GPSMAP 546
  6. Owner's manual

Garmin GPSMAP 546 Owner's Manual

Gpsmap 400/500 series
Hide thumbs Also See for GPSMAP 546:
Table of Contents

Advertisement

Quick Links

See also: Reference Manual , User Manual
GPSMAP
400/500 series
®
owner's manual
GPSMAP 400/500 Series Owner's Manual
a

Advertisement

Table of Contents
loading

Related Manuals for Garmin GPSMAP 546

Summary of Contents for Garmin GPSMAP 546

  • Page 1 GPSMAP 400/500 series ® owner’s manual GPSMAP 400/500 Series Owner’s Manual...
  • Page 2 All rights reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without the express prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this manual must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

  • Page 3: Tips And Shortcuts

    - LaMPS iNSidE THiS PROdUCT CONTaiN MERCURy aNd MUST bE RECyCLEd OR diSPOSEd Of aCCORdiNg TO LOCaL, STaTE, OR fEdERaL LawS. For more information go to www.garmin.com/aboutGarmin/environment/disposal. jsp. GPSMAP 400/500 Series Owner’s Manual Quick Links • Turning the Unit On or Off: page •...

  • Page 4: Table Of Contents

    Navigating to a Destination��������������������������� Creating and Using Waypoints ��������������������� Creating and Using Routes �������������������������� Using Tracks ������������������������������������������������� Using BlueChart g2 Vision ���������������������������� Navigating with a Garmin Autopilot��������������� Viewing Information ���������������������������� Viewing a Compass �������������������������������������� Viewing Numbers ����������������������������������������� Viewing Trip Information �������������������������������...
  • Page 5 Receiving Distress Calls ������������������������������� Man-Overboard Distress Calls Initiated from a VHF Radio ������������������������������������������������� Man-Overboard Distress Calls Initiated from the Chartplotter ������������������������������������������ Position Tracking ������������������������������������������ Placing an Individual Routine Call ���������������� Calling an AIS Target ������������������������������������ Appendix ���������������������������������������������� Specifications ����������������������������������������������� Alarms and Messages ���������������������������������� Capturing Screenshots ���������������������������������...

  • Page 6: Declaration Of Conformity (Doc)

    Product registration Help us better support you by completing our online registration today. Go to http://my.garmin.com. Keep the original sales receipt, or a photocopy, in a safe place. Contact garmin Contact Garmin Product Support if you have any questions while using your unit.

  • Page 7: Device Overview

    Device Overview Front Panel Power SELECT ➊ ➎ Range (-/+) HOME ➋ ➏ Rocker MENU ➌ ➐ MARK SD card slot ➍ ➑ GPSMAP 400/500 Series Owner’s Manual rear Panel gPSMAP 536/546 ➊ ➋ ➌ ➎ ➍ ➏ ➐ gPSMAP 441/541 ➑...

  • Page 8: Turning The Unit On Or Off

    Device Overview gPSMAP 431 ➋ ➊ Power/Data ➊ External GPS antenna ➋ gPSMAP 531 ➊ ➋ Turning the Unit On or Off To turn on the unit, press and release the Power key. When the Warning screen appears, select i agree to view the Home screen. NOTE: The first time you turn on your unit, you must configure the initial settings.

  • Page 9: Initializing Unit Settings

    Initializing Unit Settings The first time you turn on your unit, you must configure the initial settings. NOTE: You can change these settings later using the Configure screen 46). Language—select the language to display on the screen. Store demonstration—select Off. (This option is only available the first time the unit is turned on.) welcome—select OK.

  • Page 10: Adjusting The Backlight

    Device Overview Adjusting the Backlight 1. Press and release the Power key. 2. Press left or right on the Rocker to adjust the brightness. NOTE: Press the Power key repeatedly to cycle between maximum backlight, minimum backlight, and your manual setting. To allow the unit to automatically adjust the backlight based on ambient light, select auto backlight (automatic backlight is available only on the GPSMAP 536 and 546).

  • Page 11: Using The Keypad

    Home screen are green ➋ unit loses satellite signals, the green bars disappear displays a flashing question mark. ➌ For more information about GPS, visit the Garmin Web site at ➍ ➎ www.garmin.com/aboutGPS. ➏...

  • Page 12: Viewing System Information

    NOTE: If you use an SD card to transfer waypoints from MapSource HomePort , update to the most-current version by clicking Help > Check for ™ Software Updates, or check the Garmin Web site at www.garmin.com. ® (page 38). The SD card slot is on the lower-right ®...

  • Page 13: Understanding The Home Screen

    Understanding the Home Screen Use the Home screen to access all other screens. Press HOME from any screen to return to the Home screen. • Charts—selects Navigation, Fishing, Perspective 3D, Mariner’s Eye 3D, Fish Eye 3D, and Split Navigation charts. NOTE: Mariner’s Eye 3D charts and Fish Eye 3D charts are available only if you use a BlueChart g2 Vision SD card.

  • Page 14: Using Charts

    Using Charts Using Charts Your chartplotter has a worldwide basemap or BlueChart g2 cartography for either the USA shoreline or a specific country. • Navigation Chart—displays all relevant navigation data available on your preloaded maps, including buoys, lights, cables, depth soundings, marinas, and tide stations, in an overhead view.

  • Page 15: Understanding How Wind Vmg And Waypoint

    navigation Chart Menu To access additional settings or options for the Navigation chart, press MENU. full Screen Map—view the Navigation or Fishing chart in full-screen mode, without numbers. waypoints & Tracks—view, add, and configure waypoints (page 24) and tracks (page 27).

  • Page 16: Understanding Chart Data

    Using Charts Understanding Chart Data Charts for BlueChart g2 and BlueChart g2 Vision use graphic symbols to denote map features that follow the standards for USA and international charts. Other features common to most charts include depth contour lines (with deep water represented in white), intertidal zones, spot soundings (as depicted on the original paper chart), navigational aids and symbols, and obstructions and cable areas.

  • Page 17: Changing The Navigation Chart Settings

    Accessing Additional Object Information Use the map pointer ( ) to view information about on-screen map items, waypoints, and charts. To access additional object information: 1. On the Navigation chart, highlight an item press SELECT. ➊ 2. Select the item. If more than one item is in the area, select Review, and then select the item.
  • Page 18 Using Charts Roses—displays a compass rose around your boat, indicating compass ➊ direction. True wind direction or apparent wind direction is connected to a compatible marine wind sensor. ➋ weather—sets up and displays various weather parameters, including precipitation (NEXRAD), cloud cover, visibility, WX buoys, and the weather legend.

  • Page 19: Using The Split Navigation Chart

    • Off—turns the heading line off. • distance—sets the distance to the end of the heading line. • Time—sets the amount of time until you reach the end of the heading line. world Map—displays a basic world map or satellite imagery (when full world Map is selected).
  • Page 20 Using Charts To access the Perspective 3D screen from the Home screen, select Charts > Perspective 3d. Press the Range (+) key to move the view closer to your boat and lower to the water. Press the Range (-) key to move the view away from the boat. To view details about navaids such as beacons, lights, and obstructions: 1.

  • Page 21: Using Mariner's Eye 3D

    Using Mariner’s Eye 3D A BlueChart g2 Vision SD card offers Mariner’s Eye 3D that provides a detailed three-dimensional view from above and behind the boat (according to your course), and provides a visual navigation aid. This view is helpful when navigating tricky shoals, reefs, bridges, or channels, and is beneficial when trying to identify entry routes and exit routes in unfamiliar harbors or anchorages.

  • Page 22: Using Fish Eye 3D

    Using Charts Hazard Colors—Turns hazard colors on or off. The Off setting shows the land as seen from the water. The On setting indicates shallow water and land with a color scale. Blue indicates deep water, yellow is shallow water, and red is very shallow water.

  • Page 23: Using Fishing Charts

    fish Symbols (only available if sonar is present)—displays suspended targets . Targets are indicated by red, green, and yellow spheres. Red indicates the ➊ largest targets and green indicates the smallest targets. Tracks—turns the track log on or off. data bars—show or hide cruising, navigation, fishing, fuel, or sailing numbers (page GPSMAP 400/500 Series Owner’s Manual...

  • Page 24: Enabling High Resolution Satellite Imagery

    Using Charts For settings and options related to Full Screen Map, Waypoints & Tracks, Other Vessels, and Data Bars, see “Navigation Chart Menu” on To customize the appearance of the Fishing Chart screen, select MENU > Chart Setup (page 11). Enabling High resolution Satellite Imagery You can overlay high-resolution satellite images on the land, sea, or both portions of the Navigation chart when using a preprogrammed BlueChart g2...

  • Page 25: Viewing Aerial Photos

    Viewing Aerial Photos Preprogrammed BlueChart g2 Vision SD cards contain aerial photographs of many landmarks, marinas, and harbors. Use these photos to help orient yourself to your surroundings or to acquaint yourself with a marina or a harbor prior to arrival. NOTE: Use the Range (-/+) keys to zoom in and out while viewing the aerial photo on the full screen.

  • Page 26: Animated Tide And Current Indicators

    Using Charts Animated Tide and Current Indicators You can view indicators for animated tide station and current direction on the Navigation chart or the Fishing chart. To do so, information for tide station and current direction must be available in your preloaded map or BlueChart g2 Vision region.

  • Page 27: Using The Chart/Sonar Screen

    Using the Chart/Sonar Screen NOTE: The Chart/Sonar screen, like the Sonar screen, is only available when using a sonar capable unit with a transducer attached. Use the Chart/Sonar screen to view the Navigation chart, Fishing chart, Mariner’s Eye 3D, or Fish Eye 3D and sonar at the same time. To view a split chart/sonar screen: 1.

  • Page 28: Where To

    Where To? Where To? Use the where To? option on the Home screen to search for, and navigate to, waypoints, routes, tracks, and services such as nearby fuel, repairs, and ramps. NOTE: You must create waypoints and routes before you can navigate to them.

  • Page 29: Navigating To A Destination

    3. Select a destination. NOTE: Press the right or left arrow to view additional information or to display the location on a chart. 4. Select Navigate To. 5. Select go To. Select guide To when using a preprogrammed BlueChart g2 Vision card to use Automatic Guidance.

  • Page 30: Creating And Using Waypoints

    Where To? Creating and Using Waypoints You can store up to 3,000 waypoints with a user-defined name, symbol, depth, water temperature, and comment for each waypoint. To create a new waypoint: 1. From the Home screen, select Charts > Navigation Chart > MENU > waypoints &...
  • Page 31 2. Select an option. • Select Review or the name of the waypoint to view details of objects in the vicinity of the cursor. (The Review button is only shown when more than one waypoint is in the vicinity.) • Select Navigate To to navigate to the selected location. •...

  • Page 32: Creating And Using Routes

    Where To? Creating and Using routes You can create and store up to 100 routes, with up to 250 waypoints each. To create a route from your present location: 1. From the Navigation chart, use the map pointer ( destination. 2.

  • Page 33: Using Tracks

    To edit a route: 1. From the Home screen, select information > User data > Routes. 2. Select the route to edit. 3. Select Edit Route. You can edit the route name or use the chart or turn list to edit the route turns. To delete a route: 1.
  • Page 34 Where To? To clear the active track: From the Navigation or Perspective 3D chart, select MENU > waypoints & Tracks > active Tracks > Clear active Track. The track memory is cleared. The current track continues to be recorded. To retrace the active track: 1.

  • Page 35: Using Bluechart G2 Vision

    Autopilot When you start any type of navigation (go To, Route To, guide To, or follow Track), if you are connected to a compatible Garmin autopilot, you are prompted to engage the autopilot. NOTE: Autopilot can be used only with NMEA 2000 compatible chartplotters (GPSMAP 441/441s, GPSMAP 536/536s, GPSMAP 541/541s, and GPSMAP 546/546s).

  • Page 36: Viewing Information

    Viewing Information Viewing Information Use the Information screen to access information about dashboard gauges, tides, currents, user data, and other vessels. Viewing a Compass From the Home screen, select information > dashboard > Compass. Viewing numbers You can view and customize numerical data including depth, GPS information, and navigation information.
  • Page 37 To customize the numbers screen: 1. From the Home screen, select information > dashboard > Numbers. 2. Press MENU and select Configure. 3. Select the number of fields to show (3, 4, 5, or 6). 4. Select information to show in each field. Select a field to view additional information that can be shown or select Change Page and press the Range (-/+) keys to view additional fields.

  • Page 38: Viewing Trip Information

    Viewing Information Cycling Through Engine gauge Screens 1. From the Home screen, select information > dashboard > Engine. 2. Select the left and right arrows on the Rocker to move from one gauge screen to the next. Customizing Engine gauge Limits To establish the upper and lower limits of a gauge and the range of desired standard operation, you can configure up to four values for the engine gauge.
  • Page 39 Selecting the Engines Shown in gauges You must manually select the number of engines shown in the engine gauges (page 32) before you can select the engines for which information appears in the gauges. 1. From the Home screen, select information > dashboard > Engine > MENU >...
  • Page 40 Viewing Information Viewing and Synchronizing Fuel gauges Viewing Fuel gauges To view engine information, your chartplotter must be connected to a device capable of measuring fuel level, fuel flow, or both. From the Home screen, select information > dashboard > Engine. Synchronizing Fuel gauge readings with Fuel Levels From the Home screen, select information >...
  • Page 41 Selecting True, Apparent, or ground Wind for the Wind gauges The chartplotter must be connected to the peripheral devices listed below to capture the data shown on the wind speed graph. Wind Description required Sensors Speed Apparent Shows wind speed data A wind sensor�...

  • Page 42: Viewing Tide-Station Information

    Viewing Information Viewing Tide-station Information 1. Select information > Tides & Currents > Tides. 2. Select a tide station. Tide-station information is shown. • Select Change date > Manual to view tide information for a different date. Select the left and right arrows on the Rocker to move the time line.

  • Page 43: Viewing Current Information

    MapSource. If the version is older than 6.12.2, update to the most-current version by clicking Help > Check for Software Updates, or check the Garmin Web site at www.garmin.com. 3. Insert the SD card into an SD card reader that is attached to the computer.

  • Page 44: Viewing User Data

    Viewing Information 8. From the Home screen on your chartplotter, select information > User data > data Transfer. 9. Complete one of the following: • Select Merge from Card to transfer data from the SD card to the chartplotter and combine it with existing user data. •...
  • Page 45 4. Remove the SD card from the unit, and insert it into an SD card reader attached to a computer. 5. From Windows Explorer, open the Garmin\UserData folder on the SD ® card. 6. Copy the appropriate .ADM file on the card, and paste it to any location on the computer.

  • Page 46: Viewing Other Vessels

    To restore backup data to your chartplotter: 1. Copy the appropriate .ADM file from the computer to an SD card in the Garmin\UserData folder. 2. Insert the SD card into your chartplotter. 3. From the Home screen on your chartplotter, select information > User data >...
  • Page 47 About AIS Search and rescue Transmitters AIS Search and Rescue Transmitters (AIS-SART, or SART) are self-contained devices that transmit emergency position reports when activated. SART transmissions are different than standard AIS transmissions, so they look different than standard AIS symbols on the chartplotter. Instead of tracking a SART transmission for collision avoidance, you track a SART transmission to locate and assist a vessel.
  • Page 48 Viewing Information The location of this symbol indicates the closest point of approach to a dangerous target, and the numbers near the symbol indicate the time to the closest point of approach to that target� Dangerous target is lost� A red X indicates that the AIS transmission from the vessel is lost, and the chartplotter displays a message banner asking whether the vessel should continue to be tracked�...
  • Page 49 Activated dangerous target ➊ Projected course ➋ MMSI ➌ Heading ➍ Direction of turn ➎ When course over ground and heading information are provided by an activated AIS target, but rate-of-turn information is not provided, the projected course of the target is calculated based on the course over ground information. ➊...
  • Page 50 Viewing Information Activating a Target for an AIS Vessel NOTE: Mariner’s Eye 3D charts are available only if you use a BlueChart g2 Vision SD card. Fishing charts are available if you use a BlueChart g2 Vision SD card or if your built-in map supports Fishing charts. 1.
  • Page 51 6. Select Time To to sound an alarm if AIS determines that a target will intersect the safe zone within the defined time interval (ranging from 1 to 24 minutes). 7. Select a time. Viewing a List of AIS Targets NOTE: Mariner’s Eye 3D charts and Fish Eye 3D charts are available only if you use a BlueChart g2 Vision SD card.

  • Page 52: Configuring The Chartplotter

    • System information—view system information and reset factory settings (page 6). The garmin devices > Save to Card option is provided as a troubleshooting tool. A Garmin Product Support representative may ask you to use this feature to retrieve data about your chartplotter.

  • Page 53: Changing The System Language

    Map datum—change the coordinate system in which the map is structured. Do not change the map datum unless you are using a map or chart that specifies a different map datum. Time—set the time options. • Time format—select 12-hour, 24-hour, or UTC time format. •...

  • Page 54: Configuring Communications Settings

    NMEA devices, a computer, or other Garmin devices. • garmin data Transfer—supports the input or output of Garmin- proprietary data for communicating with Garmin software. • NMEa Standard—supports the input or output of standard NMEA 0183 data, DSC, and sonar NMEA input support for the DPT, MTW, and VHW sentences.
  • Page 55 1. From the Home screen, select Configure > Communications > NMEa 0183 Setup. 2. Select a setting (Sounder, Route, System, or garmin). 3. Select the NMEA 0183 output sentence to toggle the output on or off. • Posn. Precision—adjust the number of digits (Two digits, Three digits, or four digits) to the right of the decimal point for transmission of NMEA output.

  • Page 56: Setting Alarms

    Configuring the Chartplotter To label tanks as names: 1. From the Home screen, select Configure > Communications > NMEa 2000 Setup > Label devices > Change Tank Labels. 2. Select the type of tank you want to label. 3. Select Choose Names. 4.

  • Page 57: Setting The Total Fuel Onboard Alarm

    NOTE: To receive fuel-level information, your unit must be connected to an external fuel sensor, such as the Garmin GFS 10. GPSMAP 400/500 Series Owner’s Manual To enable the Total Fuel Onboard alarm and set the fuel alarm level: 1.
  • Page 58 Temp Offset—set the temperature offset for the temperature sensor of your transducer. Setting the Water Temperature Offset You must have a NMEA 0183 water-temperature sensor, a Garmin Intelliducer, or a temperature-capable transducer to measure water temperature. The temperature offset compensates for the temperature reading from a temperature sensor.

  • Page 59: Configuring Other Vessels

    Configuring Other Vessels To configure settings for boats other than your own, from the Home screen, select Configure > Other Vessels. NOTE: To configure AIS or DSC information for other boats, your unit must be connected to an external AIS or DSC device. aiS—turn AIS (Automatic Identification System) on or off.

  • Page 60: Using Sonar

    Using Sonar Using Sonar When connected to a transducer, the following chartplotters can be used as fishfinders: GPSMAP 431s GPSMAP 441s GPSMAP 531s GPSMAP 536s GPSMAP 541s GPSMAP 546s Understanding the Full Screen Select the Full Screen option to view a full-screen graph of the transducer’s sonar readings.

  • Page 61: Understanding The Split Frequency Screen

    Understanding the Split Frequency Screen Use the Split Frequency screen (dual-frequency transducer only) to view both the 50 kHz and the 200 kHz frequencies on the same screen. A 50 kHz ➊ ➋ frequency graph appears on the left. A 200 kHz frequency graph appears on the right.

  • Page 62: Understanding The Depth Log Screen

    Using Sonar Understanding the Depth Log Screen The Depth Log screen keeps a graphic log of temperature readings over time. The present depth is shown in the top-left corner. From the Home screen, select Sonar > Temp Log. Press MENU to set the duration and the scale for the log. ➊...

  • Page 63: Setting Up Sonar

    Setting Up Sonar Use the Sonar Setup screen to define and adjust settings universal to all sonar screens. From the Home screen, select Sonar > Sonar Setup. Scroll Speed—adjust the rate at which the sonar scrolls from right to left , fast, Medium, or Slow).
  • Page 64 Using Sonar 3. Press Select. From the paused screen, press MENU > Resume Sonar to continue scrolling. Range—adjust the range of the depth scale on the right side of the screen (auto, or to adjust manually, Manual Range). gain—controls the sensitivity of the sonar receiver (auto, or to adjust manually, Manual).

  • Page 65: Using The Chartplotter With A Vhf Radio

    The chartplotter can track the positions of vessels sending position reports� Quickly set up and send individual routine call details to your Garmin VHF radio� When you initiate a man-overboard distress call from your radio, the chartplotter displays the man-overboard screen and prompts you to navigate to the man-overboard point�...

  • Page 66: Adding A Dsc Contact

    2000-compatible radio and you initiate a man-overboard DSC distress call from your radio, your Garmin chartplotter displays the man-overboard screen and prompts you to navigate to the man-overboard point. If you have a Garmin autopilot system connected to the network, your chartplotter prompts you to start a Williamson turn to the man-overboard point.

  • Page 67: Man-Overboard Distress Calls Initiated From The Chartplotter

    On the radio, press and hold the DISTRESS key for at least three seconds to send the distress call. For information on placing distress calls from your Garmin radio, see your Garmin VHF Radio Owner’s Manual. For information on activating navigation...

  • Page 68: Placing An Individual Routine Call

    • Select Trail Line to edit the line color. Placing an Individual routine Call When you connect your Garmin chartplotter to a Garmin VHF NMEA 2000-compatible radio, you can use the chartplotter interface to set up an individual routine call. When setting up an individual routine call from your chartplotter, you can select one of the following channels on which you want to communicate.

  • Page 69: Appendix

    Appendix Specifications Specification Model Value Size 400 series W × H × D: 5�7 in� × 5�0 in� × 3�0 in� (14�5 cm × 12�7 cm × 7�6 cm) 500 series W × H × D: 5�9 in� × 6�4 in� × 2�9 in� (15�0 cm ×...

  • Page 70: Alarms And Messages

    Contact your dealer or Garmin Product Support. Can’t write User Card, Card May be full—error reading card; remove and reinsert. Contact your dealer or Garmin Product Support if the problem persists. Can’t write User Card, Card is Read-Only—the SD card in your unit...
  • Page 71 Sonar Service incompatible—the external sonar device you are connected to needs a software update. Sonar Timeout—there is an internal problem with the unit. Contact your dealer or Garmin Product Support to have the unit serviced. Sonar Service Lost—the external sonar device you were connected to has Appendix...

  • Page 72: Capturing Screenshots

    To copy the screenshots to your computer: 1. Remove the SD card from the chartplotter and insert it into an SD card reader that is attached to a computer. 2. From Windows Explorer, open the Garmin\scrn folder on the SD card. GPSMAP 400/500 Series Owner’s Manual...

  • Page 73: Caring For The Unit

    Software are valuable trade secrets of Garmin and that the Software in source code form remains a valuable trade secret of Garmin. You agree not to decompile, disassemble, modify, reverse assemble, reverse engineer, or reduce to human readable form the Software or any part thereof or create any derivative works based on the Software.

  • Page 74: Index

    Chart/Sonar screen clear user data collision alarm color scheme 20, 47 colors, hazard communications settings compass rose tape contact information, Garmin coordinates coordinates, grid creating waypoints using course up using 29–33 current stations dashboard data bars fish eye 3D chart...
  • Page 75 Garmin data transfer light sectors go to 5, 46 magnetic heading heading Man Overboard grid coordinates manual zoom creating waypoints using map datum Grid (North) MapSource data ground wind mariner’s eye 3D guide to mark current location...
  • Page 76 Index inserting removing SELECT key Serial Port setup specifications service points speed filter settings speed sources alarms split frequency chart split zoom communications spot depths fish eye 3D surface noise initializing symbols language system alarms navigation preferences system information system units of measure system settings shoreline distance...
  • Page 77 Index GPSMAP 400/500 Series Owner’s Manual...
  • Page 78 For the latest free software updates (excluding map data) throughout the life of your garmin products, visit the garmin Web site at www�garmin�com� © 2011–2012 Garmin Ltd� or its subsidiaries Garmin International, Inc� 1200 East 151 Street, Olathe, Kansas 66062, USA Garmin (Europe) Ltd�...

This manual is also suitable for:

Gpsmap 541Gpsmap 531Gpsmap 441Gpsmap 431Gpsmap 536Gpsmap 546s ... Show all

Table of Contents