Click on https://moumn.org/n/, with the browser on your iPhone or Android phone to access the smartphone application. This application will be loaded into phone and is tagged to be used without the access to the Internet.
As you go through a birding day, click on the species seen. The records are stored in a database on the phone. At the end of the day, click on the "> MOU" button to send the sightings to MOU.
Different browsers support this program. The current version of Chrome requires an HTTPS connection to have the GPS part of this program work. (Note that the GPS operation is disabled for "security reasons" even though the program is running with no connection to the Internet.)
More information about this application is available on the Help Page.