When automatic waypoint recording is turned on (and waypoints are not locked), waypoints will be periodically recorded to a track according to the global recording settings and the settings in the current recording scheme. The current recording scheme can be selected manually or automatically (according to recent speeds measured between the last few waypoints* and the min/max speeds configured for the schemes).
Different schemes can be used to specify different frequencies (in time or distance) and different required accuracies for waypoints.
Remove Superfluous In-Line Points
(This is a global setting and will apply no matter what the current recording scheme is.)
- Turn the switch on/off to enable/disable automatic deletion of in line waypoints as they are generated.
Toggle Automatic Scheme Selection
- Tap the ‘Automatic Scheme Selection’ switch to turn automatic selection of recording scheme on or off.
NB: Automatic scheme selection will be disabled if no scheme matches the current speed. Schemes with invalid or incomplete ranges cannot be used for automatic selection.
Therefore if ‘automatic’ is selected there should be at least one scheme that has a min speed of ‘0’ and there should be a series of schemes with speed ranges that cover all possible speeds without any gaps in their combined speed range.
Schemes with overlapping speed ranges are OK and recommended.
Select a Recording Scheme
- Tap a scheme in the scheme picker to select it (drag the picker to bring the desired scheme into view if necessary).
The selected scheme will be used for automatic waypoint recording if automatic scheme selection is disabled.
Create a New Recording Scheme
- Tap the ‘New’ button to create a new recording scheme.
The new scheme will be selected and the scheme editor will be displayed. See ‘Edit a Recording Scheme’ below for information about using the scheme editor.
Delete a Recording Scheme
- Select the scheme to be deleted using the scheme picker.
- Tap the ‘Delete’ button to delete the selected scheme.
NB: If the last scheme is deleted then a default set of schemes will automatically be created.
Edit a Recording Scheme
- Select the scheme to be edited using the scheme picker.
- Tap the ‘Edit’ button to display details of the selected scheme in the scheme editor view.
The elements of the scheme as displayed in the scheme editor are explained below.
Scheme Title
The title of the scheme as displayed in the scheme picker and in the active track label (on the map view) while recording.
Minimum Distance Between Points
The minimum distance away from the last waypoint for a new waypoint to be automatically recorded. This value is ignored when the device is asleep or when Maps n Trax is in the background.
Minimum Minutes Between Points
The minimum number of minutes since the last waypoint for a new waypoint to automatically recorded.
AND / OR
Determines if the the above two settings for minimum metres and minimum minutes are applied with an ‘AND’ logic or ‘OR’ logic. If set to ‘AND’ then both the minimum minutes AND the minimum metres must have been reached since the last waypoint before a new waypoint will be automatically recorded. If set to ‘OR’ then only one of the minimum metres OR minutes must be reached since the last waypoint for a new waypoint to be automatically recorded.
Required Accuracy
The accuracy (in metres) that the current location provided by the iOS location services facility (usually by GPS) must be for a new waypoint to be automatically recorded.
Activity Type
Based on the activity type selected (‘None’, ‘Vehicle’, ‘Pedestrian’), the location services facility in iOS will cease providing location updates (and therefore Maps n Trax will pause recording of waypoints) based on the amount of movement detected by the devices sensors. Consult the iOS documentation for more information on how this feature works.
This feature is primarily for saving battery power but it can also avoid multiple waypoints being recorded for the same location when the device is not moving.
Speed Range
If the scheme should be available for automatic scheme selection the minimum and maximum speed must be entered here.
Notes:
- There should be at least one scheme with a minimum speed of ‘0’ (zero) or blank.
- A maximum speed of ‘0’ (zero) or blank is invalid therefore there should be at least one scheme with a maximum speed that exceeds the fastest speed that could possibly be recorded.
- There should be no gaps between the speed ranges of the various schemes. If a scheme cannot be found for a current speed then automatic selection will be disabled.
- It is OK (and recommended) to overlap with the speed range of other schemes.
*How a New Scheme Is Selected
When automatic scheme selection is enabled and a new waypoint is recorded, the second slowest of the four most recents speeds (between the last five waypoints) is used for comparison with the recording scheme speeds. If there are less than five recent waypoints, no comparison or change occurs. This is safer than taking the average speed of the last few waypoints and is less likely to be skewed by an anomolous waypoint or by ceasing movement.
This recent speed is then compared with the minimum and maximum speed of the current recording scheme. If the recent speed is slower than the minimum or faster than the maximum speed of the current scheme then it is compared, in order, with all other auto-selection-capable schemes in order by speed until one is found that matches the current speed.
If a match is found, then recording changes to use the scheme which matches the current speed. If no matching scheme is found then auto scheme selection is disabled.