Field Trip has been updated today with some very notable improvements, first and foremost with the ability to save location cards for later viewing. When viewing a location or event card, you can drop a flag on the location, adding it to a favorites list. When adding it, you also have the option to quickly share the location to friends. This is a nice feature, because we don't always have enough time to stay and read through an entire card right when you're at the place.
Additionally, the update lets users report wrong locations, images and problems directly to the Field Trip group at Google. This version should also reduce battery drain -- important if you've used Field Trip much -- and several other nondescript "bugfixes." If you haven't checked out Field Trip yet, it's worth a look at the Play Store link above.