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  1. #1

    Gmap4 = View topos/aerials *offline* and your geolocation

    I have posted here before about Gmap4 which is an enhanced Google map viewer that I developed. Up until this summer I believed that Gmap4 would not work if your mobile browser was offline.

    I was wrong.

    If you follow a few simple instructions, many (but not all) of the Gmap4 features will work just fine on a smartphone, tablet or other mobile device when you are offline. Among other things, when you are offline you can:
    * Look at high resolution topo maps (t4 Topo High)
    * Look at Google aerials
    * Look at other basemaps
    * Look at GIS overlays
    * Turn on the geolocation feature (Menu ==> My location) and see the map become centered where you are standing
    * Move and watch the location symbol follow you and the map automatically move as needed
    * Touch the location symbol and see your coordinates in the current coordinate format
    * Change the coordinate format
    * Turn on/off a UTM grid
    * Turn on/off a USNG grid

    Yes, you can do all of the above while the browser in your smartphone or tablet is offline. Now let’s pop the hood and see how this works.

    Any map you see with Gmap4 consists of a bunch of small image files called “tiles” that are stitched together to cover your screen. When you look at a map while you are online, a copy of each image file is saved in the browser’s cache. If you keep the browser tab open that has the Gmap4 map, then you can then go offline and still pan the map over the area for which there are map tiles in the browser’s cache. If you pan too far, the screen will be white.

    To read plain English instructions that I guarantee you will understand (I don’t know how to write computer babble-speak) please visit the Gmap4 Help page and download the pdf file “How To Use Gmap4 Offline”.
    Help page: http://www.mappingsupport.com/p/gmap4_help.html

    From the Help page you can also find the FAQ, examples, a Quick Start guide (also on the Help page) and more.

    Gmap4 default map: http://www.mappingsupport.com/p/gmap4.php

    Joseph, the Gmap4 guy

  2. #2
    Senior Member OneClick's Avatar
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    Thanks for the info...I LOVE Gmap4! I have a shortcut right on the desktop on all my computers. I'll admit I only use the Gaia GPS app when backpacking, but still use Gmap4 for planning trips and just checking out new areas.

  3. #3
    Senior Member Bushwhacker's Avatar
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    Would you lose your cache (thus clearing the maps) if your phone crashes (turns off unexpectedly)?

  4. #4
    Yes. If your phone gets turned off for any reason or the browser tab with Gmap4 gets closed for any reason, then (1) the cache with the map tiles is gone and (2) you will not be able to restart Gmap4 until your browser is online.

    Despite those limitations, I expect the ability of Gmap4 to work offline and show your location on a map is a feature that some will find useful.

  5. #5
    Senior Member Chug's Avatar
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    Its a nice system to look over areas, Wish I could Take My GPS tracks and download it to this mapping site. As with to E-mail That map with tracks & waypoints. But I use Maptech For most of that.. Alway's nice to have more maps!.

    Nice program. I have it Hot linked for iphone & Computers..
    " Taking the gun off safety increases the velocity by 100% "

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