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Lists standard package contents and optional accessories for the GT-31.
Important safety warnings regarding operation, battery, and disposal.
Describes the GT-31 as a compact navigator, its battery life, and features.
Identifies front, back, and bottom components of the GT-31 device.
Explains the functions of the Power/ESC button.
Details how to use the 5-way directional thumb stick.
Describes activating and defining the hold key function.
Outlines steps for charging, initializing, configuring, and seeking assistance.
Explains icons for position fix and Bluetooth status.
Describes indicators for battery status and key lock.
Explains indicators for external power, alerts, and audio status.
Details icons related to memory card access and status.
Outlines system tree branches for Sat Signal, Trip Meter, and Speed.
Outlines system tree branches for Navigation, Track, and Position Mark.
Outlines system tree branches for Waypoint, Route, and Memory Card.
Continues system tree branches for Data Logger, Alert, and NAVILINK.
Outlines system tree branches for Settings and Miscellaneous options.
Provides a visual overview of the main menu pages and their functions.
Explains satellite signal strength bars and SAT usage for positioning.
Describes satellite position display and satellite number tracking.
Details information displayed when a GPS fix is obtained.
Shows the layout and key elements of the Trip Meter page.
Explains various trip metrics like total time, max speed, trip time, and odometer.
Shows current speed, max speed, and history saving commands.
Explains average speed display and its related pages.
Identifies key elements on the navigation screen like compass, speed, and distance.
Explains when navigation features are activated and arrival messages.
Details various navigation data fields like VMG, heading, bearing, and altitude.
Shows sunset time, sunrise time, and compass display options.
Explains how to cancel or skip current navigation.
Describes track logging, egg laying, and view modes.
Details interval settings, mark waypoints, save, view, and settings.
Identifies elements on the Egg Laying track screen.
Mentions track point capacity and map scale adjustment.
Explains marking track points as waypoints and setting log frequency.
Describes how to clear logged tracking data.
Shows how to view track details, date, time, and coordinates.
Explains how to select previous or next logged points.
Describes marking track points and navigating to them.
Shows how to display the nearest track point and its details.
Explains how the system calculates area based on track points.
Describes marking current location as a waypoint and editing it.
Lists methods for creating new waypoints.
Explains waypoint type, name, coordinates, and altitude display.
Details listing, GO TO, Delete, Edit, Copy, and Save to Card options.
Covers deleting all waypoints and saving to SD card.
Explains how to select and navigate to a waypoint.
Describes how to change waypoint type, name, coordinates, and distance.
Explains how to delete waypoints from the database.
Details copying waypoints and creating new ones by projection.
Explains displaying routes, waypoint counts, and route creation limits.
Describes how to delete routes from the database.
Explains navigating to the first waypoint and editing routes.
Details viewing waypoints in a route and database.
Describes selecting waypoints to insert or delete from a route.
Explains route reversing and renaming functionality.
Instructions for inserting memory cards and how the system detects them.
Explains options for enabling or disabling card logging.
Sets the minimum speed for logging points.
Configuration of NMEA items and file size for logging.
Lists and defines various NMEA-0183 data sentences.
Selects track logging file size or continuous logging.
Explains how to format and safely remove the memory card.
Sets log interval and minimum speed for data logging.
Describes saving logged data to SD card and clearing flash memory.
Explains audio and visual alerts for over speed, altitude, and targets.
Configures over speed alert thresholds and status.
Sets altitude alerts for above or below specified levels.
Configures target alerts based on waypoint types and distance.
Explains connection via USB or Bluetooth for data transfer.
Details data included in download/upload operations.
Configures device language and time zone settings.
Sets measurement units and time format (12/24 hour).
Configures date formats and arrival distance for waypoints.
Selects map datum and defines user grid formats.
Lists and describes various map datum types.
Configures power modes and DGPS source.
Sets NMEA or SIRF binary protocols for USB interfaces.
Adjusts backlight timer and LCD contrast.
Configures external power control and Bluetooth activation.
Manages Bluetooth sniff mode, username, and logged data file names.
Shows usage stats for routes/waypoints and resets to factory defaults.
Selects Navilink port and defines speed averaging time.
Configures Speed Genie threshold and Hold Key function.
Displays serial number and firmware version for updates.
Explains how to perform a cold start for GPS reinitialization.
Provides a calendar view from 1940 to 2060.
Describes viewing track data and selecting the starting point.
Explains how the system guides you back to your starting point.
Details using saved routes or reversing order to backtrack.
Explains navigating back using a reversed route.
Calculates area based on waypoints in a selected route.
Calculates area based on logged track data.
Explains the Speed Genie feature for automatic screen changes.
Configures the speed threshold to activate the Speed Genie.
Sets the time interval for speed averaging calculations.
Steps to activate the Speed Genie feature on the SPEED page.
Steps for downloading/uploading data using a USB cable.
Executing the NAVILINK utility for data transfer.
Steps to download navigation data from the device to a PC.
Steps to upload navigation data from a PC to the device.
Important notes for ensuring data consistency during uploads.
Steps to delete navigation data from the device.
Procedures for backing up and restoring all device data.
Steps to download logger data and convert SBP files.
Explains file naming conventions and extensions for NAVILINK.
Step-by-step guide to updating the device firmware using a PC.
Lists map datum abbreviations and their descriptions from 1 to 22.
Lists map datum abbreviations and their descriptions from 23 to 48.
Lists map datum abbreviations and their descriptions from 49 to 73.
Lists map datum abbreviations and their descriptions from 74 to 99.
Lists map datum abbreviations and their descriptions from 100 to 124.
Lists map datum abbreviations and their descriptions from 125 to 149.
Lists map datum abbreviations and their descriptions from 150 to 174.
Lists map datum abbreviations and their descriptions from 175 to 189.
Details the IPX7 water resistance standard and drying procedures.
Outlines the 12-month warranty period and exclusions.
Explains the repair process, service contact, and conditions for repair.
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General