SAR
Save Map
Clear Map
Map Items
Configuration
Map Layers
Settings
Import File
Export Map
Print to PDF
Clear Cache
More
Gear / Pack List
Team Members
Map Items

Map Layers

Base Layers
Shaded Relief
0
Terrain
Route Discovery
Conditions
Custom WMS / WMTS
Custom WFS
Your Data
Map Items

Add WMS/WMTS Source

Add Map Item

Map Objects
Marker
A waypoint or point of interest
Line
A route or track
Polygon
A closed area shape
Buffer
Polygon within a given distance of a line
Range Ring
Circles at given radii from a point
Sector
Pie-slice area between two bearings
Bearing Line
Line at a given angle from a point
Record Track
Record your path via GPS
Photo Waypoint
Take a photo; drops a pin at your location
SAR Mode
Assignment – Line
SAR search assignment along a line
Assignment – Area
SAR search assignment polygon
Clue Marker
Mark a search clue or evidence
Op Period
Group assignments by operational period

Measure

Point
Point Info
Elevation, coordinate formats, declination
Line
Distance
Distance along a drawn line
Bearing
Bearing between two points
Elevation Profile
Elevation gain, loss and chart along a line
Polygon
Area
Area in acres and km²

Find

Point Info

–°, –°
Z4– ft / – m
N
Record Track
Marker at GPS
Add marker here
Start line here
Start polygon here
Point info
Measure from here
Center map here
Navigate to here
Copy coordinates

Edit Object

SAR Assignment Details
Probability of Detection (POD)

Settings

DISPLAY
Dark Mode
Show Labels
Map Rotation (heading-up)
Default Mode
COORDINATES
Coordinate Format
Distance Units
Elevation Units
MAP BEHAVIOR
Show GPS Accuracy Circle
Blue ring showing GPS accuracy radius
Keep Screen On
Prevent screen sleep while tracking (mobile)
Snap-to-Trail Drawing
Snap lines to roads/trails when available
APPEARANCE
Label Size
Size of object name labels on the map
Default Object Color
TRACK RECORDING
Track Recording Detail
How often GPS records a point (Low=30s, Med=10s, High=5s, Highest=2.5s)
OFFLINE & CACHE
Auto-Cache
Every map tile you view is automatically cached for offline use. Browse an area while online and all viewed layers work offline.
Active
Download Current Layer
Pre-cache the current base map at all zoom levels for this viewport.
Download ALL Layers
Pre-cache every base map + overlay for this viewport. Switch between any layer offline.
Cached Tile Storage
Tap Refresh to calculate
Clear Tile Cache
Frees storage — your map objects are not affected
DATA
Export All Objects
Save all map objects as GeoJSON
Import File
Load GeoJSON, GPX or KML
Clear All Map Data
Removes all saved objects, folders, and settings
ABOUT
Version
0.0.3 (Build 5)
Gear / Pack List
0 items 0 oz (0 lb)
Team Members
0 members
Recording 0.00 mi · ↑0 ft · 0:00
Welcome to ZYRN TOPO
This app needs a few permissions to work properly. You can change these anytime in your device settings.
Location
Show your position on the map, track recording, and drop markers at your location.
Waiting…
Compass / Motion
Rotates the location arrow to show the direction you're facing. Mobile only.
Waiting…
Clipboard
Copy coordinates to clipboard from the map context menu.
Will ask when needed
Skip for now
⚠ Map tiles not cached for this area