I live near Redmond, Washington, USA. In the past I have been a programmer for Boeing and also spent
many years in the real estate field. A few years ago I was using off-the-shelf software to make jpg
images that showed property boundaries on topographic maps. Then I realized I could write my own enhanced Google Map viewer and show property boundaries on detailed
topographic maps. Then I modified a copy of my code so I could use it to share interactive maps in trip
reports showing hikes/scrambles I did in the Washington State Cascades. That work resulted in an enhanced Google map viewer I called Gmap4. Due to policy changes at Google in the spring of 2018, I have shut Gmap4 down for most users.
Currently I am developing GISsurfer which will be a replacement for Gmap4. I am continuing to add more features and my intention is that GISsurfer will replicate most of the features that were in Gmap4. Here is a link that will start GISsurfer and display the default map of the world.
To see some disaster and recreation maps that display data that is hosted on GIS (Geographical Information System) servers, click Menu ==> GISsurfer special maps. For more information you can visit the GISsurfer homepage.
I am also the founder of PropertyLineMaps.com. That service provides an online map link showing the client's property lines and a GPX file with coordinates for each property corner. If you want to find 'lost' survey stakes, market your property, hunt on your side of the line or locate the approximate corners of unsurveyed land, take a look at the website and see how we can help you. The cost is amazingly reasonable since the heavy lifting is done by breakthrough software I developed. Gmap4 continues to work for the clients of this service.
Another project is FindMeSAR. This 'no cost' public service browser app uses the GPS chip in a smartphone to quickly display the user's coordinates and an accuracy value. Color coded screens are used to display the coordinates in four different formats. A 911 dispatcher can ask a cell phone caller to browse to findmesar.com, wait just a bit and then read off their coordinates usually to a 10 meter or better accuracy.