Looking for a way to survey on demand

[ikfarm]

I have a Skytraq bluetooth enabled RTK receiver. Using Lefebvre Ntrip client, I can get an RTK signal I feed into the phone as a mock location. I want to put the RTK antenna on a survey stick and activate waypoints manually every time I place the stick and hit a button.

I've gone through the manual but can't find any way to do this other than turning on the GPS track and setting it to a time delay, then make sure I have the stick placed before the next point fix. Is there some way I can add a button to activate the fix manually into the GPS log, so I can then import that into something to precisely map a field? This is for surveying farm fields for hydrological changes.