The limit of ROCK that is abovewater is the edge of the mass exposed at mean lower low
The limit of ROCK that is underwater is as shown on the final compilation provided to
USGS by NOS.
If ROCK is exposed at mean lower low water and is < 0.03" in the longest axis, and
is on an existing NOS chart,
For a topographic/bathymetric edition only, if ROCK is on the final compilation provided to USGS by NOS, then capture.
Source Interpretation Guidelines
Do not capture exposed rocks < 0.03" as ROCK. See rules for islands within LAKE/POND, SEA/OCEAN, and STREAM/RIVER.
Groups of rocks are sometimes surrounded by limiting danger lines, as
delineated by NOS. Capture individual rocks as ROCK. Capture the extent
of the limiting danger line as HAZARD ZONE.
Numerous closely spaced ROCKS that form a chain along the coastline or
close to the shore are collected as REEF. (Quantified rules are TBD)
Capture all ROCKS, except submerged rocks shown on topographic maps.
ROCKS on pre-1961 maps that are not consistent with current capture
conditions are not captured.
Revision - General
Revision - Standard
Revision - Limited
Do not revise. Retain existing features.
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