The FMB is a scaled drawing of your survey number. Knowing what the lines, numbers, and abbreviations mean lets you check your boundary, subdivisions, and extent at a glance.
The F-line is the field boundary — the boundary of an individual survey number or plot. The G-line is the village boundary that wraps the whole village. Every dispute about 'where my boundary runs' is about the F-line.
The FMB carries the survey number (and its subdivisions like 12/1, 12/2), the extent, and the chain/link measurements along each boundary segment. These measurements are the legal numbers — if the ground measurement differs, the FMB governs the record until a re-survey.
You'll see the north arrow, scale line, survey number stickers, village name, and classification abbreviations (nanjai/punjai/natham). The gomal/reserved portions and tank boundaries are usually hatched or labelled.
For one survey number the sheet stands alone. For land spread across several numbers or subdivisions you need a combined FMB sketch that joins the sheets with the shared F-lines aligned onto one map.
When the boundary line between two survey numbers is disputed, nothing settles it faster than both FMB sheets joined in one map. We combine your survey number and the adjoining one so the official boundary line — the F-line in your FMB — is visible in a single document.
Common questions about Combined FMB Sketch services across Tamil Nadu.
F-line is the field boundary line separating one survey number or plot from the next.
G-line is the boundary line of the entire revenue village.
They are the official survey record. Ground differences are resolved through the revenue process, not by changing the FMB.
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