I purchased this app mainly for the vertical curve calculator since it would be an easy one to use as my phone is always on me. The downside is that you can't input a negative grade because only the number keypad pops up. There's a copy/paste in a full keyboard app workaround if you have negative% but annoying.
The other option that would be nice would be the ability to input station increments instead of having to key in each sta and then have to push calculate. It's a lot of extra keystrokes for a touchscreen and as it stands, I'll be using my programmed HP calculator and not recommending this. These options only make necessary sense, if possible to execute in this app.
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Nyemba Kasabwe
Stake monster
NoelN