The Fast Track Indicators

The fast track provides you with 18 different kind of indicators. Some of them are track related, this mean that indicators will be only available if track recording is enabled and it will be updated depending on the track recording interval.

Menu -> Preferences -> Navigation Track -> Track Interval

The Fast Track indicators can be grouped in the following categories:

a) Speed Indicators

Speed: it is the SOG, Current Speed Over Ground in knots, provided by GPS.

Max Speed: Max speed (knots) during current track. It is not track dependent but it is reseted every time track is deleted.

Average Speed: Average Speed (knots) since track start point. Even points recorded when boat is stopped are recorded and counted for the average speed. Dependent of track.

VMG: Velocity Made Good (knots), actual speed of approximation to the current waypoint. So it is only available if a target waypoint is defined.

Average VMG: Average of Velocity Made Good. This indicator is shown in the leg comparison screen, to evaluate the overall performing of a Leg.

UpWind VMG: Velocity Made Good (knots) towards wind, in other words, the actual speed you gain up-wind.

Example: With a Speed of 6 kt, Course 45º and a wind direction of 90º, UpWind VMG  = 6 kt * COSINE(90º – 45º) = 4.2 kt

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Effective Speed: Is the distance between starting track point and current track point divided by the track duration. Dependent of track.

ETA: Estimated Time to Arrive to waypoint = distance to waypoint divided by current speed.

b) Course Indicators

Course: is the COG (Course Over Ground), the GPS heading in degress.

Bearing: is the absolute bearing to current waypoint. Varies for 0º to 359º

Relative Bearing: it is the difference between Course and Bearing; varies between -180º and 180º

Deviance: it is the difference between Course and Reference Heading to waypoint ( see post Sailing to a waypoint).

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c) Distance and Position (and others…)

Distance to arrive: Distance to Waypoint (in nautical miles or meter depending on preferences).

Effective Distance: Is the distance between starting track point and current track point. Dependent of track.

Latitude & Longitude: Current boat GPS Lat&Lon, there are three different types of representation depending on preferences (D,DDDDº, Dº M,MMMM’ or Dº MM’ SS”)

Total Distance: Total track distance. Dependent of track.

Track Duration: Total track distance. Dependent of track.

Enjoy your Sailing, Nautka Apps

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Sailing to a waypoint

You can start sailing to a waypoint by 3 different ways: 

a) Menu -> Destination -> Waypoint

b) MapView -> Select Waypoint -> Choose “Sail to” option in the popup window

c) During a route (Routes will be explained in detail in following posts)

Once you start sailing to a waypoint, the “reference heading” is created. Reference heading is the bearing to destination waypoint from the location where you start sailing towards it. Reference heading, will not change until you choose a different destination.

Don’t confuse reference heading with bearing to waypoint, while the first one keeps unchanged, bearing change as your boat moves through the waypoint. Bearing is represented by a gray arrow in the course board.

ImagenLeg changes

If wind direction is defined, the application will created a new leg every time the wind line is crossed.
When wind direction is not defined, the application will create new legs every time reference heading line is crossed.

In the map view, every leg is represented by a straight line, colored in a red whose intensity depends on the average leg speed. Every tack or gib is represented by a red pin, which you can touch to open a popup window with all the preceding leg information.

 

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The leg comparison screen

This screen helps you to analyze and quickly understand how you are sailing to the waypoint.

Together with the reference heading (showed on top), there are 2 more course references at +/-45º, to help you better understand your deviance from the reference.

In the leg comparison tool you can compare current leg performance with previous one. 
For each of them you can analyze: 
 – Distance traveled
 – Average VMG, the higher the better
 – Average Deviance from the reference heading, the lower the better

Previous leg average deviance is represented with a gray line in the course board. When relative bearing gray arrow is aligned with previous leg deviance mark it could be a good moment to gibe or tack for a direct leg through buoy.

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Graphics

Another powerful tool to understand your sailing are the graphics.

This view analyze the time evolution of some sailing metrics in a chart view, as Speed, VMG (Velocity Made Good) and Deviance. Chart view provides two buttons:

Refresh: To update graph information

Reset: To start new graph view since the current timestamp

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Voice notifications

Sometimes when you are sailing is not easy to watch the phone screen or handle it in one hand when you need both hands for maneuvering. In this cases, voice notifications could be very handy, as all the information provided by the app is spoken by the phone. If the ambient noise is to loud to hear your phone, consider using wireless headphones or similar.

Activate voice notifications by:

    Menu -> Preferences -> Sound Notifications -> TTS

 

Enjoy your Sailing, Nautka Apps