ArcGIS
Map Viewer
View several different base maps (National Geographic, OpenStreetMap, ESRI
maps).
GPS Visualizer Draw
Add markers, lines, polygons, import/export in KML and GPX formats, and
measure distance/area. Right-click on a place on the map to display the
coordinates and the elevation.
GISsurfer
View several different base maps (National Geographic, OpenStreetMap, ESRI
maps). Display coordinates in UTM, USNG, and MGRS formats.
CalTopo
Add markers, lines, polygons, import/export KML, GPX, GeoJSON formats and
save an area in geospatial PDF format. Measure the distance/area,
calculate compass bearing, and the mouse cursor displays the coordinates
and the elevation of a location.
Perry-Castañeda Library
Map Collection
A collection of country and regional maps.
Undersea Feature Names
Gazetteer
Seafloor map to view/search for underwater features such as reefs and
seamounts.
Country Maps (like browsing a world atlas):
USGS topographic maps:
Free Map Tools
Features include finding the elevation on the map, measure distance/area,
and a time zone converter.
OpenStreetMap Compass
Determine the compass bearing on the map, including magnetic declination.
uMap
Create/edit places and routes using OpenStreetMap data. Add layers and
import/export in GPX, KML GeoJSON formats.
David Rumsey Map Collection
A collection of historical maps. View selected maps using Google Earth.
National Park Service Maps
National Park maps.
ArcGIS
Overlay Maps
View several different types of maps (National Geographic world map,
physical map, USA Topo Maps) in WMTS and KML formats. Note: To view the
KML/KMZ format, click the ArcGIS Earth link.
Natural Earth
Public domain maps in shapefile format.
Overpass Turbo
Filter and extract data from OpenStreetMap. The Wizard feature allows you
to easily filter data by using keywords, for example, locate all museums
or restaurants for an area.
* Some of the apps might only be available in the Android platform.
OsmAnd
Online/offline maps using OpenStreetMap. Add places, record GPS tracks,
measure distance, and display info on the map (such as altitude, speed,
GPS status).
Avenza Maps
Display geospatial PDF and GeoTIFF maps and view OpenStreetMap (online
only but can select an area for offline use). Add placemarks, record GPS
tracks, measure distance/area, and export map data in in KML, GPX, and CSV
formats. Display a compass and navigate a destination using the compass
bearing.
Locus Map
Online/offline maps. Add places, record GPS tracks, view maps in WMS/WMTS
formats, and import/export in KML/KMZ and GPX formats. Navigate a
destination using the compass bearing.
Organic Maps
A simple interface using OpenStreetMap for offline maps. Directions and
save places.
Magic Earth
Online/offline maps. Includes satellite images and real-time traffic.
Geo
Tracker
Easy, simple interface for GPS recording. Export and import in GPX or KML
formats.
CalTopo
The app version for the CalTopo
website.
GPS
Test
GPS settings/status. Displays a map of satellites, speed, altitude,
latitudes/longitudes, and the location of the Sun.
GPSTest
Displays the status of navigation satellites in a list and on a map. Add
your actual location on a map that will determine the accuracy of the GPS.
Compass
Steel
Includes a picture-in-picture window where the compass is displayed over
other apps such as a map on an app or web browser.
Get
Geo-Coordinates
Find the latitude and longitude of the current location using both GPS
and/or the cell phone connection or Wi-Fi.
The World Factbook
Provides country/regional information as well as maps.
Earth Point
Convert coordinates in different formats such as UTM and MGRS.
Magnetic-Declination.com
Find the magnetic declination of a location on a map or by searching for a
place.
Magnetic
Declination Compass
Web-based compass uses the current location to determine true north,
magnetic north, and magnetic declination. There’s also an app version.