Thanks for the comments - I wasn't anticipating the price tag to be so controversial though! Just as background, registered Apple iOS development costs $99/year and there's nearly 5 months of hard programming and testing involved so I thought it might perhaps be worth the price of a coffee...
The premise behind the app is that it can be taken on the road and used in place of your calculator to automate the standard maths. It's the portability for 'field use' that's the main design feature. At the end of the day the log can be imported into a spreadsheet for all other post-measurement purposes which is what I also do; it won't replace your favourite spreadsheet in this respect but could perhaps generate the input for it. (I paste the CSV file into my spreadsheet and have the spreadsheet refer to these pasted cells.)
If location services are being used then the GoogleEarth KML export will show the spot elevations (though for a more comprehensive profile it would be better to trace the route in 'paths' then use the 'show elevation profile' option). I've used it on 2 live measurements and on neither had call to press a calculator button or do a single calculation. There is however a calculator function that will translate counts directly into metres or yards as required. Once the calibration is logged every other calculation is quite dynamic.
In response to Jim's query, it is possible to flip between metric and imperial splits by toggling the metric/imperial split button although they will not be displayed simultaneously.
I might have to disappoint Lyman here because I'm not at all experienced in Android development: iOS uses Objective-C for iOS whereas I think Android is Java for Linux so there would be a lot of work to port it across.
When run on an iPad it will be in the expanded iPhone format - it will require a bit of tweaking of the layout to make it native to the iPad screen; at the moment a few of the buttons get misplaced after compiling for the native iPad resolution.
I'm hoping for some good suggestions and observations as feedback for the first update: It works for my measurement methodology but there will be many techniques I'm blissfully unaware of...