NZ TOPO50 instructions - iPhone version
Drag on the screen to pan around the map, use a two finger pinch to zoom in and out.
Tap anywhere on the map to toggle full-screen mode on and off.
A green icon indicates the GPS sensor is active and your position will show as a blue dot on the map. A red icon indicates that GPS is not currently available. There are many possible causes. In some cases this may be temporary. If your position is indicated with a grey dot then this indicates that the position data is old and may be inaccurate. It will turn blue when new position data becomes available.
Toggles follow mode on and off. Follow mode will focus the map on your current GPS location and continue to follow your location on the map as your location changes. GPS must first be switched on. Manually panning the map will disengage follow mode.
Change preferences for map grid, track recording, and display details. Additional information and map legend.
GPS accuracy depends on many factors, including any obstruction of a clear view of the sky. It may also take some time after the GPS is first activated for your device to obtain an accurate lock. If enabled, your device will initially use less accurate data from cellular or wifi signals until the GPS position is available.
The wedge projecting from the central location dot gives an approximate field of view based on the direction your phone is facing. This uses the magnetic compass bearing sensor in your phone. This is easily influenced by other magnetic fields. See further detail below.
When you enable follow mode your altitude, altitude uncertainty, and current speed will be displayed in the top information bar. When follow mode is disabled, the top information bar will display the distance and bearing from your current position to the focus point on the map. If you have an active track recording then the estimated arrival time at the focus point of the map will be displayed. This is calculated using the straight line distance and the average speed over the entire active track history.
Select the flag icon to create a new waypoint (or to start recording a track, see below).
Choose ‘Set Flag’ and a waypoint will be created at the focal point of the map (in the crosshairs). You can adjust the position of the crosshairs before creating the waypoint if you need to adjust the position.
Tapping the waypoint flag will display further information about the waypoint.
Hiding the waypoint will remove the flag from the map. It can be shown again from the search menu, see below.
Deleting the waypoint will permanently delete the waypoint.
Waypoints are exported using the kml format. These files can be imported and converted to other formats using a range of other available software.
Exporting is carried out by email. You will need a registered email account on your device.
Importing waypoints (and tracks) can be achieved by long pressing on a kml attachment in an email. The iOS context menu will give you an option to open the attachment using the NZ TOPO 50 App.
Select the flag icon to start and stop track recording.
Select ‘Record Track’ to start recording. Recording will start once an accurate GPS lock has been received and you will see a track start marker appear on the map. If you switch on the GPS to get a position lock before starting recording then your track will start recording immediately.
The waypoint button on the bottom bar will show a recording indicator. Tap to bring up options for ending recording, or to create additional waypoints.
You can manually deselect the GPS during track recording. This will save battery life and pause track recording until it is reactivated.
If you switch to another app or put your phone in standby then the track will continue recording only if you have enabled Background Recording in the settings menu (see below).
Tap the waypoint icon on the bottom bar to bring up the waypoint/track menu choose End Recording to stop recording a track.
Further details on the track can be seen by selecting the disclosure arrow on the map screen, or by finding your track in the search list.
The track info screen shows track statistics and a graph of speed and elevation. Tap the x-axis label at the bottom to toggle between time and distance axes. Zoom in on the graph details with two finger zoom and pinch gestures.
The track name can be edited from this screen or the track can be exported.
Select the search icon to find built in placenames on the map and to manage user waypoints and tracks.
Some features, such as rivers, are labelled in multiple places on the map. In these cases, multiple listings of the feature will show in the list.
User waypoints and tracks are also displayed in this list. They can be identified by the icon to the left. Built in placenames have no icon.
Use the bottom tab to only show user waypoint (flags), user tracks, or only those waypoints and tracks currently shown as visible on the map.
Click a waypoint or track to find it on the map.
This option will display the track or waypoint details, as described above. The name can be edited, and the track can be exported.
This option will switch the track/waypoint between displayed or hidden on the map.
Swipe left to show the delete option for user tracks and waypoints. Built in placenames cannot be edited or deleted.
“Use NZ map grid coordinates” switches between coordinate display using the NZ map grid easting and northing, and display in degrees longitude and latitude.
“Record tracks in background” determines whether a track will continue to record your position when you switch to another app or put the phone into sleep mode. If it is switched off then track recording will pause while the app is in the background and continue when you switch back to the NZ Topo50 app.
“Show hunting permit overlay” displays the DOC open hunting permit boundaries on the map. See details below.
“Show compass overlay” displays a compass bar at the top of the map screen. See details below.
Track recording settings:
“Target accuracy” determines which GPS positions reported by your device will be recorded as a track. If you set this to a low value then track points will only be recorded when accurate positioning data is available. Increase this value if accurate position data is not available but you would still like to record it.
“Min distance” is the minimum distance that needs to be travelled before new position data is added to the track. Using a low value will give you more data points and better resolution of small deviations in your route. Higher values will be less susceptible to fluctuations due to GPS signal variations.
Min timestep” is the minimum time step before new position data is added to the track. Smaller values will record more data and consume more memory. Larger values will give better long term average velocity calculation.
Switch on the compass overlay from the settings menu, and switch on GPS and the compass bar will display at the top of the screen.
The bearing displayed is the orientation of your phone (ie which way it is pointing). Bearings are all relative to true north, not magnetic north.
A red cross indicates the relative bearing to the focal point on the map. To use this feature, select a point on the map that you would like to navigate to and position it in the center of the map under the cross hairs. Now rotate until the cross on the compass bar is aligned with the triangle in the compass bar and you will be directly facing the target location on the map. The distance from your current position to the target location will be shown in the information above the compass bar.
To navigate to a waypoint or track start marker, select the waypoint on the map so that its info box is displayed above it. The relative bearing to this waypoint will now show as a flag on the compass bar. Align the flag in the compass bar with the triangle and you will be heading towards the waypoint. The distance to the waypoint is displayed in the info box for the waypoint.
Note that these navigation features are based on your phones magnetic sensor. The accuracy of this measurement depends on phone model and environmental factors. The presence of other magnetic fields or metals that interact with magnetic fields can significantly affect the accuracy.