Rally computer multifunction in regularity (constant speed) mode is used for drive control aiming at maintaining constant speed with the help of waypoints – without measuring the route during the rally, without errors caused by changing road surface, calibration or travel path, without the necessity of using tables and stoppers.
Perfectly in accordance to plan and set points.
Key features and traits:
- calculation of the achieved average speed between waypoints past along the route;
- calculation of average speed to be maintained till the next waypoint so as to “drive in time";
- measuring the time between points;
- calculation of loss or gain in meters at each waypoint past along the route;
- automatic (using GPS) or manual marking of passed waypoint;
- using Garmin tracing the route to the next waypoint;
- continuous indication of the distance to the next point.
The principles of functioning
The idea is to measure the continuity of speed in relation to the time of travel and known distance between waypoints. It's easy to calculate all the parameters describing the illustrative passage in the drawing below.
The waypoints are determined by a new and innovative use of GPS. In our device, the waypoints are described by geographical coordinates and are automatically marked/desselected while driving the route. It suffice to drive the route section which waypoints and distances between the points were stored in the memory of the device.
During such a journey all the parameters of the drive will be automatically calculated at each point, and there will be presented suggestions on driving the route section to the next waypoint.
The device does not replace a well-calibrated tripmeter which can help in preparation of files and is necessary during the drive between the waypoints, but:
- after having driven the route in favourable conditions and having prepared the data file, each subsequent passage, in all weather conditions, will give reliable measurements
- the presentation and interpretation of data is identical to the most common form of scoring: you have to be on a particular stretch of the road at a particular time - no one checks what was shown on your tripmeter when you arrive at a waypoint
- in the expected time, and your tripmeter shows gain or loss for it may have incorrect calibration or you might have gone along a little different track
- but thanks to the recording of the results you can analyze your ride yourself.
Another approach to raids at a constant speed opens the possibility of using modern methods : digital maps, the so called traces, that is gpx files, which are described as modern tools to prepare files of waypoints indicating the tracks and routes.
Before the rally.
Files with waypoints can be stored in memory:
- Using a keyboard
- In a comfortable way prepare txt files on a PC ( Win or Mac ) and using pen drive transfer them to the device.
File creation – classical method
Using the device menu, you can create a file that will be used later to drive at a constant speed. The file can be given any name, such as OS1 or ZR1, and then you should make a tour of the route. At each point that seems “interesting” as a waypoint, using the device keys you mark the waypoint and enter the distance as indicated by a well-calibrated tripmeter. Repeat this action at any number of waypoints. At the end of the travelled section save the file in the memory of the device for later use.
File creation – alternative method 1
Maybe you have or you can register the so called trail using a device equipped with a GPS - navigation, telephone, ... . With such a trail, and the resulting gpx file, you are 100% sure that the registered coordinates will be on your route during the rally. The trail usually contains a lot of points - you can modify it and leave for instance every tenth point. From the trail you can also calculate the distance. It is fraught with constant error which is simple to verify by driving the section and making the trail, while at the same time measuring the distance using the tripmeter.
After confirming differences, thanks to the registered trail the file will contain the waypoints which -
- are 100% along the route and are correctly recorded
- are placed frequently which means that every few hundred meters you will have the average speed calculated irrespectively of the tripmeter
- thanks to information on distance (route) to the next waypoint you have the ongoing control of the correctness of the route – when the distance will significantly increase it could mean that you have lost your way....
Below is the link to the registered 1000 m section of a trail which is used for validation of taximeters ( in Warsaw ), and a map with the drafted trail.
File creation - alternative method 2
This method is even simpler than the previous one. It does not ensure such a precision as the previous methods but the error does not exceed 100 m irrespectively of the length of the section as it results from the distance presentation on the maps.
With the help of Internet browser and digital maps, such as :
- Google maps
- Bing maps
delineate the route between the points. You can enter the points on the maps in the form of geographic coordinates. You can also mark the points along the route.
Having the route delineated by the coordinates you can easily prepare the file for the device which will later serve during the rally.
Below are the links to:
- 1000m control section delineated with the help of Google Maps
- 1000m control section delineated with the help of Bing map
Monte Carlo Historique
For each of the methods the created file is always in the format as below (file to drive at constant speed over test section of 1000m, consisting of 4 points):
1 = 52.252767000,20.964258000,0
2 = 52.250255000,20.964970000,427
3 = 52.245980000,20.966560000,916
4 = 52.244196000,20.967932000,1000
During the rally
Before embarking on the section, using the menu select the file with the points and distances as active. Its name will appears at the bottom of the screen. At the start of the section, enter the average speed which should be maintained along the stretch. At the time of the actual start, press the OK button or external resetter to start the operation of the device. (It is recommended to use the same button which starts the tripmeter).
From that moment the device operation is completely automatic. Each time you pass the waypoint you will get on the display the information on:
- achieved average speed from the previous point
- average speed that you must keep so as to be on time at the next point
- the loss / gain you made in time or distance
- time to the next point taking into account the loss / gain that you made
Unlike the tripmeter, the data is calculated on the basis of the route entered in the file and not on the basis of current measurements. You are independent from the errors caused by skids, rally driving track different from the pre-rally test track , etc.
After the end of the section there is created the file with the results, which by using pen drive you can transfer to a PC to view the travelled route, the losses / gains at waypoints (at your waypoints and not at the secret waypoints of the organizer).
The service is possible thanks to the six button keypad with large and clear buttons and permanently assigned most important functions. The data is displayed on the display with a resolution of 240x120 pixels. There is a choice of two colours of display.
The tripmeter is resistant to the loss of supply power caused by, for instance, the necessity to disconnect vehicle power supply due to emergency. The measured values are stored and after the power is reconnected the measurements will be continued from the saved values. The memory is non-volatile. Therefore you will be never left without the information on the travelled route and the passage of time.
The tripmeter has aluminium case ensuring protection against external factors. The case is resistant to overflowing and splashing. On its side the case features mounting brackets and connecting cables terminated with Superseal and USB connectors.
Rally computer multifunction tripmeter has the capacity to update firmware via USB and pen drive. Self-reliant updating is possible only within the scope of acquired functionality.
- with built-in fast GPS module – marking the points that can be done automatically by using GPS or manually by pressing the button
- without built-in GPS – the points are deselected manually by pressing the button