Interactive GMU Map for Hikes

Created: October 5, 2021

Usage Notes

Please read all of these notes before using the interactive map!

We are using this interactive map a little differently from how GPS Visualizer intended it to be used. Rather than drawing tracks on it, we are using the tracks to draw GMU boundaries. That is why the right sidebar says Tracks rather than GMUs. PARK locations are shown within each GMU as a flag. Mouse over the flag to see the hike name. If hikes share a common trailhead, you’ll see only one hike name for a given PARK location.

The initial presentation of the map is at maximum scale so the first thing you need to do is decrease the scale by selecting your GMU of interest. You select your GMU of interest from the GMU sidebar by placing the cursor over the  next to the GMU number. When it is over the , the cursor will turn into a cross. Then click the left mouse button. Notice that the GMU boundary lines are the same color as the GMU number, though sometimes this is difficult to see.

If you have located a hike of interest and you want to find out its GMU number, hover the cursor over the line in the map until it turns into a pointing finger. The number shown is the GMU number.

If necessary, change the map with the map control in the upper left corner to your area of interest. The map control is the standard Google map control that you can use to zoom in, zoom out and move the map up, down, right or left. Other ways to manipulate the map are to place the cursor on the map and hold the left button down and drag the map up, down, left or right. Additionally, you can place the cursor on the map in an area of interest and double left click to expanded the map around the cursor. Double right clicking contracts it similarly.

Placing the cursor over a GMU number in the GMU side bar will cause a label to appear on the map for that GMU. Successive clicks on the GMU number in the GMU side bar will turn the GMU’s boundary lines off and on. When they are off, the GMU name is gray.

If desired, the GMU sidebar can be moved.  Place the cursor over the gray bar on the top of the sidebar, hold the left mouse button down and drag the sidebar to where you want it.

You can also change the “background” for the map from the initial OSM ( to any of the other choices, which change from time to time. Some are topo maps; others are aerial maps. Some (usually called “hybrid”) show street names as well as topo or aerial features.

Requesting an Update

Updating the map contents is in part a manual process, so new PARK locations aren’t automatically displayed. Use the Contact form under the Communications menu tab to request an update of the PARK locations.