iStumbler is a Mac utility that might prove to be of good use while traveling. With its help, you can immediately identify nearby Wi-Fi networks, Bonjour services or Bluetooth devices and find out which is the best solution for getting your Mac online.
As soon as you launch the tool it immediately starts fetching network information and reveals the obtained details in 5 panels: Wi-Fi, Bluetooth, Bonjour, Channels, and Location. You have access to various settings to change the appearance of the interface (for example, change font size), an option to automatically select the best network, etc. All program settings can be found in the Preferences window of the tool.
Also, iStumbler uses minimum CPU resources, provides you with accurate data in no time, and allows you to print the offered network information directly from its interface.
The only aspect you need to take into consideration is that you can find cheaper solutions for investigating Wi-Fi networks.
So, it's up to you to decide, based on your requirements and budget, if it's worth purchasing iStumbler for your Mac or not.