(Continued from Part 3.)
There’s an App for That
The ability to run thousands of different apps is where the power of a mobile device really comes into play. It allows you to have access applications, files, sensors and other things in the palm of your hand. One of the most obvious app uses for mobile devices in field operations is maps – you can use them to figure out where you are, plan you need to go, note your findings, etc. I’ve standardized on mapping apps that utilize Open Street Maps (OSM) data files and support GPX files for exchanging tracks and other information. My primary mapping app is OsmAnd+, along with the contour line plugin; it’s not as detailed as USGS topographic maps, but the terrain in my area of operations (AO) is only moderately hilly so I don’t really need that level of detail. I make sure to download offline maps for every area I could conceivably end up operating in, and they don’t take all that much space. OsmAnd+ also allows you to create markers on your maps, which can be exported via GPX files to other systems to share, and there are plugins that allow you to take pictures/videos/notes and associate them with map locations as well as do freehand drawing on maps.
Yes, I realize that GPS may not be available, but you can still use the apps just like you would a paper map and compass, without the problem of constantly marking up your paper maps. In addition to the OSM map apps I also have PDF copies of USGS topo maps files for my AO stored on my SD card, and high-resolution satellite map screen captures I got by connecting my laptop to a friend’s 4K TV using the laptop’s HDMI port.
Taking notes is another thing I do frequently in the field, and using my mobile device allows me to stretch out the stash of paper notebooks in my preps. You’re not going to write the next ‘War and Peace’ on a mobile device, but for quick short notes it works well. I use an app called Joplin Notes, which allows me to synchronize with a Joplin Notes server running on my home base network when I return home, supports insertion of pictures and other files (like recordings) into notes, has full end-to-end encryption and allows you to create simple checkbox lists (for my to-do items). It’s not as powerful as something like Microsoft OneNote, but there’s no cloud required and I have full control over all of my information. Note-taking in field operations can be a useful way to keep track of discoveries, create reminders, follow checklists and get a leg up on after-action reports (if you’re into such things).
An audio recording app is another useful tool for field operations. You can record quick spoken notes, interviews, capture ideas, etc. One feature you should look for is the ability to save your recordings to an SD card – the one I use is called Voice Recorder (original name, I know), and is one of the highest-rated apps on Google Play. Another possible application for a voice recorder is to record intercepted radio communications you encounter while you’re out in the field. You can just hold your mobile device’s microphone up to your radio’s speaker and record, or [if the impedance matches] you could connect the audio out from your radio to the microphone jack on your mobile device using a microphone-compatible cable. Note that this is a good solution for recording radio traffic for short periods of time – I’d recommend no more than an hour or two, since most of the recording apps don’t support voice activation, and it’ll quickly consume the battery on your mobile device. If you want the ability to do voice-activated recording of radio traffic for long periods of time I’d recommend getting a small dedicated voice recorder that supports line-in so you can directly connect it to your portable radio/scanner with the afore-mentioned cable and let it collect recordings for hours and hours.Continue reading“Tactical Technology for TEOTWAWKI – Part 4, by J.M.”