NetStumbler (also known as Network Stumbler) was a tool for Windows that facilitates detection of Wireless LANs using the 802.11b, 802.11a and 802.11g WLAN standards.
A trimmed-down version called MiniStumbler is available for the handheld Windows CE operating system.
Netstumbler has become one of the most popular programs for wardriving and wireless reconnaissance, although it has a disadvantage.
Netstumbler has integrated support for a GPS unit.
With this support, Netstumbler displays GPS coordinate information next to the information about each discovered network, which can be useful for finding specific networks again after having sorted out collected data.