Dowload Maps for offline usage

Downloading Maps

The Fast Track allows you to download maps into local storage for offline usage from Open Street Maps and Open Cycle Maps.


You can bulk download the selected map area and extend it later with new bulk downloads or manually navigating through the map view.


Following map providers policies, bulk downloads can retrieve map images from zoom level 1 up to zoom level 16. Each download can retrieve a maximum of 600 images.


Wait until all the images are downloaded and the map will be opened automatically.


You can extend the map area and zoom level up to level 18, navigating through the downloaded map in the map view, clicking the connect button


You can open your downloaded maps, from the map layer selection menu.

Enjoy your Sailing, Nautka Apps


Image Maps Calibration

Calibrating Map Images

A calibrated image is a group of two files named equal except the extension:

– A map image (.jpg or .png)

– A text file (.map) that specify how the image pixels corresponds to real world coordinates

If you only have the map image in jpg or png format, you need to create it’s associated .map file. There are computer mapping softwares that can help you to create a .map file form a map image, as OZI Explorer.

In this post it is explained how to generate a .map file by two different ways:

– Within the tool itself

– Manually

Calibrating Maps within The Fast Track

The NOAA’s New York Harbor nautical chart, will be used to illustrate this process.

First of all you need to choose a couple of reference points, first one should be close to the image upper right corner (NW), second one in the lower left (SE).

Calibrate 1

With an image editing software identify the pixels x,y coordinates of the selected reference points.

Calibrate 2

Create two waypoints with TFT with a long touch over the selected points in the map view.

     Calibrate 3  Calibrate 4

Now you need to “map” the image pixels with the waypoints, select:

Menu -> Cartography -> Image maps -> Calibrate Image Map

select the first waypoint and introduce the reference point 1 x,y coordinates.

And then select the second waypoint and introduce the reference point 2 x,y coordinates

Calibrate 5

If everything is ok, then your image map should appear now in the map screen! Congratulations!

Calibrate 6

Manual .map generation.

A .map is a plain text file. For The Fast Track we only need to write 8 lines:

first 4 lines define 4 pixels in the image

MMPXY,<point number>, <pixel X coordinate>, <pixel Y doordinate>

next 4 lines define the coordinates of those pixels

MMPLL,<point number>, <pixel longitude>, <pixel latitude>

The number of the calibration points is defined in the sense of clockwise, starting from the northwest point, which is point 1, following by the northeast (2), the southeast (3) and finally the southwest (4)

In fact, The Fast Track only uses points 1 & 3 for its calibrations.

Once generated the .map file, copy both files .jpg & .map into the mobile device under the same path.

Test your map with:

Menu -> Cartography -> Map Image-> Open Map Image

The following file is an example of a calibration file for the New York harbor:









Calibrate 8 Calibrate 7

Enjoy your Sailing, Nautka Apps

Open Sea Maps Offline Cartography

The easiest way to prepare OSM offline maps and make them available without internet connection is as follows:

1. Open the application before going into sea, while you have internet connection

2. Select Open Street Maps cartography (Menu -> Cartography)

3. Preview on the map the locations where you plan to sail, in different zoom levels

By this procedure, all the maps loaded for display, has been stored in the phone memory and will be retrieved in case there is no connection.

I hope this “mini” tutorial helps you.

Other Methods

There are much more complete methods when you want to download a lot of information, but many of them are not recommended even by Open Street Maps, such as the Mobile Atlas Creator application.

1.The official method would be through the download option on the OSM website

2. Convert the downloaded OSM files into “tiles”, with application like OsmAndMapCreator

Once converted into tiles, copy the tiles into the following mobile path:


Enjoy your Sailing, Nautka Apps

The Fast Track Routes


Routes are pre-defined paths created from a group of waypoints, selected in the sequence you desire to navigate them.

Not to be confused with a Track which is like a breadcrumb trail, allowing you to see all the points where you have been navigating. In fact, while you sail a Route, you also generate a Track of your route navigation.

Route Creation 

So, in order to be able to create a route, you first need to create or import its waypoints.

This post explain in detail all the options to create a waypoint with the tool:

Once waypoints are created you need to specify the sequence you want to sail them, by Menu -> Routes -> Create/Edit Route



Importing Routes

Another way to create a route is to import it. The Fast Track can import routes in GPX format, were Route Waypoints are specified as <rtept>

Sailing a Route

Once you have loaded a route, you can start sailing it by Menu -> Route -> Start Route

Current route destination waypoint is selected automatically by the App. Starting by the first one, The Fast Track will change from waypoint n to the next one, waypoint n+1, when:

1. Boat is closest to the waypoint n than the minimum distance specified in Preferences -> Navigation Route

2. Boat distance to waypoint n+1 is less than the distance between waypoint n and waypoint n+1

3. Boat relative bearing to waypoint n+1 is less than 180º

You always can change current destination waypoint by selecting Menu -> Route -> Next Wpt / Previous Wpt

Current Waypoint’s name font is red


Racing Routes

You can define a race as a route. You don’t need to add the start line as waypoints routes, by default the app will start the route navigation once the race chronometer is finished, adding a route segment from the middle of the race start line to the first route waypoint.


Saving Route

You can save a route by Menu -> Route -> Save Route, this command will save the route in a GPX format.

If you only want to save the waypoints, then you need to execute Menu -> Admin Wpt -> Sace Waypoints

Route Statistics

Menu -> Route -> Statistics will provide you with information about:

– Route Length

– Number of waypoints

– Starting / Ending Waypoint


In next releases it will be included the possibility to invert the sense of the route.

Enjoy your Sailing, Nautka Apps

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


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).


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

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.






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.



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


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



A Waypoint is a coordinate (latitude, longitude) identifying a point of interest as a buoy, a cap, a port or your final destination.

With The Fast Track you can define Waypoints in four different ways:

1. Projecting your current boat position to a certain distance and bearing

2. Selecting a point in the map view

3. Entering the waypoint coordinates. Select your preferred coordinates encoding in Preferences -> Navigation Preferences

4. Selecting your current position. This option is very useful to define the Start Line buoys, sailing close to them. Or as a MOB utility.



Once you have created a waypoint you can define it as you navigation destination or continue defining new waypoints.

You can save your waypoints through:

Menu -> Admin Wpt -> Save Wapoints

and retrieve them in future sesions with

Menu -> Admin Wpt -> Load Wapoints

Waypoints are stored in standard GPX format, so you can load waypoints defined with other mobile or PC tools as Oruxmaps, CompeGPS, Garmin BaseCamp, etc…

In the map screen, Waypoints are displayed as blue flags


You can “touch” a waypoint to view its coordinates and select one of the Waypoint actions:

1. Sail to it

2. Rename it

3. Delete it

4. Access the weather forecast for this waypoint


Enjoy your Sailing, Nautka Apps