Gmap4 is a browser app, not a native app
- Nothing to download, nothing to install
- Click a Gmap4 link and the map opens in your browser
- Runs in most browsers on most devices from cell phones to desktop computers
- Over 20 optional link parameters determine how the map looks when it opens
- Touch-friendly interface on cell phones and other mobile devices. Mouse interface on laptops and desktops.
- Geolocation symbol follows you as you move.
- Geolocation display uses current coordinate format
- Touch the geolocation symbol to (1) see your coordinates, (2) get a link you can text or email to anyone that will show your location and (3) get driving directions with your location as the start of the trip.
- Gmap4 works offline however (1) it can only be started if your browser is online and (2) while you are online you have to view the maps you want to use offline so they are saved in the browser's cache.
- Button always displays name of the current basemap
- Google street map, Google aerials and Google terrain
- Public domain high resolution aerials for USA - partial coverage
- High resolution USGS topographic maps for USA
- Topographic maps for Canada
- Worldwide open source maps from the OSM project
- All white basemap - Can be useful with GIS overlays
- Google streetview
- Weather radar (USA)
- Google traffic
- Contour lines on aerials
Geographical Information System (GIS) Overlays and Basemaps
- View GIS data as basemaps and/or overlays
- Display any user-specified ArcGIS MapServer layers and/or ArcGIS ImageServer data
- Display any user-specified WMS layers. Support for both 1.1.1 and 1.3.0
- Click on GIS overlay data and see all the attribute data direct from the GIS server to your screen
- Turn overlays on/off and change the stacking order
- Specify GIS data for the map either as parameters in the Gmap4 link or in a text file
- Example maps of the USA and various states with hundreds of GIS overlay layers with recreation, weather and wildfire data.
- Latitude longitude in decimal degrees
- Latitude longitude in degrees and decimal minutes
- Latitude longitude in degrees minutes seconds
- USNG - U.S. National Grid - Supported by many Gmap4 features
- MGRS - Military Grid Reference System
- Corner of screen displays coordinate for map center
- Corner of screen displays coordinate for cursor location (laptop/desktop)
- Rightclick displays coordinates in all the popular formats for the spot that was clicked
- Mobile users can simulate a rightclick
- U.S. National Grid (USNG)
- Military Grid Reference System (MGRS)
- Many place names
- Most reasonable ways to write coordinates. (Latitude longitude, UTM, USNG or MGRS)
Display data files
- Data files must be online, they cannot be displayed from your harddrive.
- KML and KMZ
- Google My Map
Display a delimited file format
- Waypoints - Use your own symbols
- Clicking a waypoint displays a popup that can hold text and links
- Fancy labels for waypoints
- All labels can be 'on' or 'off'
- Solid lines and dashed lines - You set color and width
- Include a maximum of 5 KML/KMZ files
- Specify GIS data for the map
Menu button features include:
- Link to this map. This link will reproduce the map as you see it on your screen. Share your map in trip reports, emails, websites and blogs.
- Embed code for web developers
- Change coordinate format
- Turn geolocation on/off
- Trip planning (Draw and save). Save a GPX file or a "map-in-a-link".
- Variable hill shading when looking at the high resolution topographic maps (t4 CalTopo Hi-res)
- Current magnetic declination for the center of the map
- Turn labels on/off (depends on data file)
- Turn crosshair at map center on/off
- Turn aerial tilt on/off (certain urban areas)
- Mark one end of the trip with a rightclick or by tapping the geolocation symbol
- Fill in the other end of the trip with an address, placename or coordinate - including USNG
- Change the route by dragging it and the turn-by-turn text updates automatically
Documentation and Help
- Easy to read - no 'computer-speak'!
- FAQ webpage
- Examples webpage
- What's New (change log) webpage
- Help webpage with several pdf 'Help' files including a "Quick Start". Also videos produced by Gmap4 users.