Have questions? We have answers.

Ground Penetrating Radar (GPR) is a non-invasive scanning tool that fires high-frequency radio waves into the soil and listens for echoes. By timing and plotting those reflections, GPR creates a subsurface image that pinpoints underground objects, layers, or voids—such as marked or unmarked graves—without any digging or damage.

Yes. GPR cemetery surveys are completely non-invasive: the radar cart rolls across the turf without touching monuments, and the radio waves are lower power than a cell-phone call. Sentry Mapping’s process leaves the soil, turf, and even the most fragile 1800s marble or sandstone headstones untouched.

Yes. High-frequency ground penetrating radar (GPR) can pinpoint unmarked graves without digging by detecting disturbed soil, coffins, or voids below the surface. Sentry Mapping’s cemetery GPR surveys deliver precise GPS coordinates, letting you update burial plot maps and avoid accidentally disturbing unknown interments.

Ground-Penetrating Radar can reliably reveal the presence and general boundaries of a buried void, but its reflections blur at depth. GPR therefore estimates a cavity’s width and depth within a tolerance—often a few inches—rather than providing an architect-grade “exact” measurement for most cemetery-mapping projects today.

Yes. High-frequency ground-penetrating radar can still pick up century-old graves in most soils because disturbed soil layers, vault remnants, or voids remain detectable. While resolution fades as coffins decay, Sentry Mapping’s specialized GPR and GIS workflow regularly finds 19th-century burials and older, as long as site conditions (soil, depth, moisture) are reasonable.

Ground-penetrating radar is highly accurate. Under typical cemetery conditions, Sentry Mapping’s GPR pinpoints a burial center within about ±6 inches and estimates depth within ±10 percent. Results depend on soil, moisture and grave materials, but high-frequency antennas and precision GPS let us document virtually every grave without disturbing the ground.

Even on a tight budget, a churchyard can convert paper documents to digital records by outsourcing one turnkey survey. Sentry Mapping uses ground-penetrating radar, precision GPS and free web-map delivery to capture every marked or unmarked burial, then loads the data into Chronicle cemetery management software so volunteers can update records online.

Sentry Mapping turns paper ledgers into a living, searchable database. We scan and key your records, confirm every burial with ground-penetrating radar, map each plot by GPS, then load everything into an online Geographic Information System (GIS) and cemetery-management software. Staff and visitors can now search names or lot numbers in seconds.

Use high-frequency ground-penetrating radar (GPR) to scan the cemetery surface, then overlay the subsurface reflections on a precise GPS/GIS map. This non-invasive method detects unmarked grave shafts, outlines each burial plot, and creates a digital record—so you find every grave without digging or disturbing the soil.

Sentry Mapping uses non-invasive high-frequency Ground Penetrating Radar (GPR) to scan every square foot of the site. This allows us to detect soil disturbances that mark burials, GPS-tag each hit, then publish the results on an interactive GIS cemetery map. The entire survey is completed without any form of excavation, preserving the historic grounds.

Sentry Mapping’s cemetery mapping service instantly turns ground-penetrating radar and high-precision GPS survey data into a clean, scalable cemetery map. Every grave—including unmarked burials—appears in its exact location, and plot boundaries are redrawn automatically, giving you an accurate master map plus an interactive online version within a few days to a few weeks depending on the size of your cemetery.

Yes. Ground Penetrating Radar (GPR) is considered safe for operators, cemetery staff, and visitors. The equipment uses very low-power radio waves—about one-thousandth the strength of a cell phone—so it does not disturb human remains, monuments, or nearby electronics. Surveys are noninvasive, silent, and require no digging.

Sentry Mapping provides a free, no-obligation estimate for each project. Every property is unique and the exact cost varies with soil type, terrain, tree cover, and record condition. Quotes include full GPR coverage, high-precision GPS positioning, drone imagery, and the conversion of raw scans into a color-coded digital cemetery map with printed and interactive deliverables.

A burial-plot map is the precise, static master layout of every grave and available space, produced from a one-time GPR/GPS survey. A web-map is the online, clickable version of that map that staff and families can access online to search from any device. A GIS survey is the underlying field data-collection process that feeds both products.

Before you sign a contract, ask any ground-penetrating-radar mapping company about their cemetery experience, GPR frequency and GPS accuracy, data deliverables, software compatibility, crew credentials, project timeline, on-site disruption, cost structure, and liability insurance. Clear answers reveal whether they can truly protect your graves and records.