|Typical Theodolite screen image|
Another neat function of Theodolite is the "A-B Distance/Heading" function. You can simply tap the "A" button at one location, then travel to the next location and tap "B" to have Theodolite calculate the distance and heading between the points. You can also estimate object heights if you know your distance from the object by aiming at the bottom of the object and tapping "A" and then aiming at the top of the same object and pressing "B".
The heading function is also potentially useful. You can aim the camera at location (pier head, jetty, boat, etc.) and mark it by pressing "A". Next, aim the camera at a second location (another boat, buoy, etc.) and press "B". Then hit "Calculate" and you'll have the option of displaying the distance between the two objects at a specific heading, finding you're location relative to the two points using triangulation, or plotting the points on a Google map.
The Theodolite app appears a bit intimidating and complex at first, but like many apps on a touchscreen device, you'll get the hang of it fairly quickly by poking around with your fingers. While I wouldn't recommend relying on this app alone for any necessary navigation functions, it is fun to experiment with all of the functions. Of course most of these functions are superfluous if you have a chart plotter and/or other GPS on board, but it's always good to have back-ups and a second way to double-check measurements, headings, etc. If you're a tech-junkie sailor, this app will occupy you nicely when you're becalmed on the water.
Theodolite App Review Summary
Pros: Multi-functional app, good rangefinder, useful distance/heading calculations
Cons: Busy screen, a bit complex
Bottom Line: Fun app with many uses/function that can back-up your GPS