01How do graves get their GPS coordinates in the first place?
The GPS coordinates that enable grave navigation do not come from phone cameras or user estimates — in professional mapping, they come from a survey. When Memor maps a cemetery, field teams use RTK (Real Time Kinematic) GPS equipment or drone photogrammetry to establish the position of each plot to within a few centimeters. RTK GPS works by comparing satellite signals against a fixed base station positioned on the cemetery grounds, eliminating the atmospheric errors that reduce standard consumer GPS to meter-level accuracy.
Drone photogrammetry produces a high-resolution aerial mosaic of the entire cemetery, accurate enough to identify individual stones by their photographed positions. From this mosaic, each plot's position is extracted and tied to its burial record — longitude and latitude attached to the name, dates, and plot reference of each interment. Both methods produce coordinates that are entered into the management record for each grave and immediately available to the Memor navigation system.
02How is cemetery walking navigation different from road driving navigation?
Road navigation routes you along streets that exist in standard mapping databases and follow a consistent logic: named roads, turn points, building addresses. Cemetery navigation routes you through grounds that do not appear in standard mapping data, along footpaths that may be unlabeled or change seasonally, to a target that is a point in open space rather than a building entrance. The two problems share the same structure — find the best route from A to B — but the inputs are completely different.
Memor builds routing around each cemetery's actual path network, mapped alongside the plot coordinates. The app knows which footpaths connect which sections, how visitors typically move through the grounds, and where the natural walking routes run from each entrance. When you search a name and start navigating, the route reflects real cemetery paths rather than a straight-line projection across lawns and through sections. As you walk, the live icon updates your position continuously, adjusting the displayed route if you take a different path through the grounds.
03How accurate is GPS navigation when you reach the grave?
GPS navigation to a specific grave has two layers of accuracy: the accuracy of the grave's stored coordinates, and the accuracy of your phone's current position. Professionally surveyed plots in Memor are positioned to within 30 centimeters — less than a foot. This is the coordinate of the center of the plot, fixed in the system regardless of weather, signal quality, or device.
Your phone's GPS accuracy varies with conditions. A modern smartphone in open sky typically achieves accuracy of 3 to 5 meters with standard GPS, and closer to 1 to 3 meters with assisted GPS over a strong signal. This level of accuracy is sufficient to bring you to the correct row and identify a range of a few nearby stones. When navigation completes, you will be within a few steps of the correct plot. Confirm the inscription on the stone as the final step — the navigation delivers you to the right location, and your eyes confirm the right marker.
04What affects GPS accuracy inside a cemetery?
Tree canopy is the most common factor reducing phone GPS accuracy in older cemeteries. Dense overhead foliage blocks satellite signals, widening the uncertainty radius around your current location. Urban cemeteries adjacent to tall buildings experience similar signal degradation from multipath error, where satellite signals reflect off building surfaces before reaching the phone receiver. Neither issue affects the stored position of the grave — only your phone's ability to know precisely where it is at that moment.
When signal quality is poor, Memor displays a larger uncertainty circle around your position icon — a visual indication to move more slowly and verify by reading headstones rather than relying entirely on the navigation display. In practice, even degraded GPS in a cemetery brings you within one or two rows of the correct stone. The combination of approximate navigation and visual confirmation of the inscription is more than adequate for finding a grave in any conditions that allow a cemetery visit.
05What happens in cemeteries that have not been professionally mapped?
In cemeteries that have not joined Memor's partner network and have not been professionally surveyed, GPS navigation still functions — at a different level of precision. Users who have visited a specific grave can pin its location using their phone's GPS at the moment they are standing at the stone. This pin, accurate to whatever the phone achieves in that location, is immediately available to every future visitor searching the same name in Memor.
Community pins are useful approximations that make most cemetery visits faster — even a rough pin narrows the search in a large cemetery from an extended row-by-row walk to a short confirmation. When a cemetery joins Memor's platform and a professional survey is completed, community pins for that cemetery are replaced by survey-grade coordinates. The navigation experience improves automatically for every user who searches that grave, without any action required from the family who originally placed the pin.
06Can GPS grave navigation work offline in remote cemeteries without cell signal?
Many older cemeteries are in rural areas with limited or no cell coverage. Memor addresses this with offline map caching: the cemetery's map, path network, and burial records can be downloaded in advance while on Wi-Fi or cell signal and stored on the phone for use without connectivity. When you enter a cached cemetery's grounds without signal, navigation functions from the downloaded data, and your phone's GPS continues to track your position without any network access.
The offline cache includes the cemetery layout, plot positions, and burial records for the cached area. It does not include records or updates added after the cache was created; cache data is refreshed automatically when the app reconnects to a network. For planned visits to remote cemeteries, opening the cemetery in Memor while connected — allowing a few minutes of automatic downloading — fully prepares the app for use without any signal at all.