Android Field Triangulate has historically stored events (collections of readings comprising a triangulation) in memory. The intention was to create a few readings (in a relatively limited timeframe) and create a triangulation. Job done, triangulation shared. In actuality this isn’t how things always work, and wasn’t always sufficiently reliable.
Despite attempts to save these readings to instance state, in memory storage could lead to lost data … say if the application is unloaded (e.g. by a battery saver killing applications.) Lost data is never good, and this was never the intention.
Note: The reason for network connectivity at first setup is because the persistent store utilized is a cloud synchronized database. In theory (given a named account) this could be used to synchronize events (readings and triangulations) between devices. Please contact me if that seems of interest.
BTW: If/when asked for location permissions, Android Field Triangulate doesn’t need more than “Allow only while using the app”.
Be it a wild-land firefighter locating smoke or a wildlife biologist tracking subjects, or one of many other users, Field Triangulate is often used in the back country, away from cellular networks. Field Triangulate works offline (to accept locations and bearings and generate a triangulated location) but it cannot show maps offline. I often get asked about adding “offline maps” support to Field Triangulate, but that is not on the product development roadmap at this time.
Topo Maps+ from Glacier Peak Studios is an excellent offline topographic map solution for iOS (iPhone and iPad.) It provides access to a wide variety of offline downloadable maps, and offers GPS features.
Field Triangulate for iOS version 1.1.2 will allow a triangulation (latitude / longitude) to be sent to Topo Maps+ (even when fully offline) in order for Topo Maps+ to display the map for that location. Topo Maps+ will use the current map, and current zoom to present that location.
Use Topo Maps+ to survey the terrain at the location, and between you and that location.
Topo Maps+ will even allow you to use that triangulation as a waypoint, allowing you to easily navigate to it.
Do you use other Topo Mapping Apps?
Let me know what application you use for offline-capable topographic maps on Android devices, and I’ll look to integrating Field Triangulate to that on Android.