Details of Navigation Data Items

The Live Navigation data panel can be customized as described here.  When you do a "Change Data", the items available are listed below:

Note that the displayed units can be changed in the Settings, Units menu.

GPS

Course over Ground: Your direction of travel relative to the earth

Speed over Ground: Your instantaneous speed relative to the earth

Position: Your current Latitude and Longitude, or position in the selected position grid (see Settings > Units)

Accuracy: Some measure of how accurate the GPS fix is. If you are using an external NMEA format data source, this is the HDOP. If you are using the location service, the precise meaning may be different.

Altitude: Your height above sea level, or your height above some other datum on some devices. (Note, GPS is less accurate for altitude than for horizontal position)

Time: Time of day reported by the GPS, converted to the device's selected timezone

24h Time with seconds: Time of day with seconds, usually accurate to UTC +/- 1 second.

Average Course: Direction of travel averaged over the past 30 seconds

Average Speed: Speed averaged over the last 30 seconds

Satellites: Satellite signal strength (NB, only works with external NMEA data, not from the built-in location service).

Drop Mark Button. Adds a button to the data screen which creates a mark at the current GPS location. You can customize the icon etc, and use different buttons to record the location of different items.

Sensors

Compass Heading: The direction the device is pointing based on the magnetic field sensor in your device. See Compass Heading

Barometric Pressure: Data from device pressure sensor in mBar

Relative Altitude: Change in altitude from atmospheric pressure sensor. Tap-and-hold to calibrate the altitude offset.

Goto

(Note, these fields are active when you tap a mark or waypoint, and use the popup menu to navigate towards a point or follow a route.)

Distance: Your distance to the next waypoint

Bearing: Compass bearing to the next waypoint

Turn Angle: Angle between your current course-over-ground and the direction to the waypoint

Turn after Mark: When following a route, the angle between your current course-over-ground and the direction to the waypoint after the next one (helps you to plan for turns before you reach the waypoint).

CrossTrack: The perpendicular distance from your current position to the course line.

(Note, if you are navigating to a mark, or if you have not yet reached the starting waypoint of a route, then a "course line" is set up from your current position when you initiate navigation. If you are following a route, the course line is the closest leg of the route)

Arrow: Graphical indication of turn angle

Time to Next WP: Estimate of the amount of time it will take to reach the waypoint, based on your current averaged speed and direction.

ETA Next WP: Estimated time of arrival at the next waypoint

Dist to Route End: Distance from your current position to the next waypoint, plus the total distance of remaining legs in the route

Time to Route End: Estimate of the amount of time it will take to reach the end of the route, based on your current averaged speed and direction.

ETA End of Route: Estimated time of arrival at the end of the route

VMG Parallel to Leg: The component of your instantaneous velocity in the direction parallel to the course line.

VMG Towards Mark: The component of your instantaneous velocity in the direction towards the next mark

Waypoint name: The name of the next waypoint.

Coming Up: A list of the next few waypoints in your route, with the distance to each waypoint.

See also Using Marks and Using Routes

 

Track

(Note the "latest track" is the track is the track you are currently recording, or the one you were most recently recording)

Logging Button: A button to start/stop recording your track

Distance travelled: The length of the latest track

Moving Time: The elapsed time of the latest track, minus the amount of time spent stopped

Elapsed Time: Elapsed Time of the latest track

Time not moving: Amount of time spent when the amount of movement is less than 30ft.

Average Speed: Average speed while moving (ie not stopped) since beginning of the track.

Max Speed: The maximum speed recorded, discarding anomalous spikes.

See also Recording Tracks

 

Instruments

(Note these data items require connection to a marine instrument system, and you must activate a Professional License)

Boat Speed: Speed through the water from the VHW sentence

Apparent Wind Angle: Wind angle to the bow, from the MWV sentence

Apparent Wind Speed: Wind speed relative to the vessel, from the MWV sentence

True Wind Direction: Wind direction relative to the earth, from the MWD sentence

True Wind Speed: Wind speed relative to the earth, from the MWD sentence

Depth of water: Water depth, adjusted for transducer depth if known, from DBT sentence

Water Temperature: Water temperature from MTW sentence

Rudder Angle: Rudder angle from RSA sentence

Average Rudder Angle: Rudder angle from RSA sentence, averaged over about one minute. (use to see effect of sail trim on helm)

Engine RPM: Engine revolutions per minute, from RPM sentence. Shows both engines if two are present

 

Instruments / Timer

These items provide a count-down / count-up timer, designed for sailboat racing, but can be used for any purpose

(Use Tap-and-hold, Timer settings menu to configure the count-down period, or to set the count-down to a specific time of day)

Time to start: Shows the amount of time. A + sign indicates the timer is counting up, after the start

Start countdown sequence: Button to restart the count-down.

Ping Start Line Right Mark: Button to store the GPS position of a point at the right-hand end of the start line (or on an extension of the start line)

Ping Start Line Left Mark: Button to store the GPS position of a point at the left-hand end of the start line (or on an extension of the start line)

Distance to line: Perpendicular distance from your position to the start line (line is extended both ends). A negative value means you are over the line.

ETA Early/Late at Start: If you continue your current course and speed, indicates the timer value when you will cross the line. Ignores line end-points - the line is extended both ends. Shows a + sign if you are late for the start, a - sign if you are early.

(Note, device built-in GPS units are typically not accurate enough for use on the start line. An external high precision GPS is recommended)

Start-Line Bias vs True Wind: If you have a True Wind input (from the MWD sentence), you can display the angle of the start line to the wind, to help decide which end of the line is favored. (Note this does not take any current into account.)

Start-Line Bias vs Axis: Set the axis as your estimate of the wind direction, or as the bearing to the first mark, and this will let you know if the line is skewed relative to the axis.

 

Instruments / Axis

This section allows you to setup a reference direction, know as the Axis, and display various data items as a bearing relative to the axis. You can use it as a course-to-steer, or for monitoring changes in heading or wind. Press-and-hold any of these to setup the Axis.

Axis: Just shows you the current Axis setting.

Heading vs Axis: Shows the compass heading relative to the axis. Plus means you are steering to the right of the axis, minus means you are to the left.

COG vs Axis: Shows the GPS course-over-ground relative to the axis. Plus means you are traveling to the right of the axis, minus means you are to the left.

True Wind vs Axis: If you have True Wind (from the MWD sentence), this shows the wind direction relative to the Axis. Plus means the wind has shifted to the right, minus means it has shifted left.

 

Other

Load Layout: Adds a button that can be configured to load a specific layout file. You can design two or more layouts, and use the buttons as shortcuts to switch between layouts. First you have to save a layout file (Menu, Data Layout, then select Save Layout as...). Lets call that "Layout A".  Next, design another layout, and save it as Layout B.

Important: after configuring a Layout button, don't forget to save the current layout, before you press the button, otherwise you will lose the configuration. To change a button after it has been configured the first time, select "Arrange" mode, then tap-and-hold the button.

Logo: just for branding

Blank: sets an empty item

Hint to change data: part of the default layout.