Most of the miles on this coast get run inside. The Waterway takes you behind the barrier islands from the Amelia River south, and for long stretches the navigable water is the marked channel and not much beside it. Then the Keys invert the problem. Out of Biscayne Bay you are in Hawk Channel with reef outside and hard bottom inside, and the inside route becomes a set of named cuts that each carry their own depth and their own bridge. What governs you changes as you go. At the north end it is the bottom. Through the built up middle it is the deck over your head. In the Keys it is both at once, on a tide that is local to the channel you happen to be in.
The Florida East Coast pack is built from 242 official NOAA ENC cells, the fifth largest cell count of the eighteen US regions Helm charts. Inside it sit 130,555 individual charted soundings, the third highest count anywhere, with 21,872 depth contours and 21,040 depth areas around them. The pack also carries 1,784 bridges, 800 overhead cables, 1,206 dredged areas, 1,015 charted wrecks, 4,269 charted obstructions, 1,097 underwater rocks and 1,061 restricted areas. All of it is 33 MB on the phone, downloaded once and then read with no signal.
The pack holds 5,563 lateral beacons and 625 lateral buoys. That beacon count is the second highest of the eighteen regions. The buoy count sits fourteenth. The ratio is the Waterway itself: inside, the channel is marked with daymarks on driven piles, numbered in sequence, and they do not swing on a chain or drag off station in a blow.
What that changes is which half of the picture you treat as fixed. On a buoyed coast the mark moves and the bottom mostly stays put. Here the mark stays exactly where the chart puts it and the bottom around it is the part that shifts. A red triangle on a pile is a position you can take a bearing on and believe. It says nothing about how much water is beside it. That answer comes from the sounding, and the two questions are worth keeping apart in your head when you are running an unfamiliar stretch on a falling tide.
There are 13 safe water marks in the whole box. Approaches on this coast are defined by the pair of marks at the channel edge rather than by a single mark to find out front, so an inlet you have not run before is worth reading on the chart while you still have the time to read it. After dark the reference is the 2,044 charted lights, which come out of the same ENC cells as everything else in the pack.
| In the chart pack | Count |
|---|---|
| NOAA ENC cells | 242 |
| Charted soundings | 130,555 |
| Depth areas | 21,040 |
| Depth contours | 21,872 |
| Lateral buoys | 625 |
| Lateral beacons | 5,563 |
| Charted lights | 2,044 |
| Anchorage areas | 38 |
| Bridges | 1,784 |
| Overhead cables | 800 |
| Dredged areas | 1,206 |
| Charted wrecks | 1,015 |
| Charted obstructions | 4,269 |
| Underwater rocks | 1,097 |
| Restricted areas | 1,061 |
| NOAA tide prediction stations | 351 |
Counted from the Helm chart pack for Florida East Coast, built from official NOAA electronic navigational charts. The pack downloads at about 33 MB.
Soundings are where this region stands out. Only two of the eighteen US regions carry more of them, and the density is what makes a depth profile along a drawn line worth looking at, because the number under a given point is a measurement somebody took rather than a guess stretched across a gap. The 21,872 contours and 21,040 depth areas give the same water its shape at a glance.
Beside the depth, the pack counts what is in the way:
The pack carries 1,206 dredged areas, fourth most of the eighteen regions. Their charted depths, the drval figure that comes straight out of the ENC, run from 0.4 m at the shallowest to 15.8 m at the deepest, with a median of 10.2 m. In feet that is a little over one at the bottom end, about 52 at the top, and about 33 in the middle.
The spread is the whole point. A dredged area on this coast can be a deepwater approach into a commercial port or a cut with barely enough water for a skiff, and both are drawn as dredged. Reading the label as a green light is the mistake it invites. The number worth having is the one attached to the particular area you are entering, and that is what Helm reads for each of the 1,206.
Dredged also means maintained, and a maintained channel shoals between surveys. When Helm plans a leg down one of these and no channel condition survey has been ingested for it, the explanation says the depth came from the chart rather than from a survey of the channel's current state. On a coast with this many dredged areas, knowing which kind of number you are looking at is worth more than the number itself.
One region out of eighteen has more bridges than this one. Run the inside route for a day and the dimension that decides your passage is measured upward at least as often as it is measured down. The charted vertical clearance for those spans is in the pack, checked against the air draft you enter, and an opening bridge is read in its down position rather than as open sky.
The 800 overhead cables are the ones to look for in advance, fourth most of any region Helm charts. A bridge is visible from a long way off and you can see what you are dealing with while you still have room to turn around. A cable crossing gives you none of that, so the charted height is the height you are working from.
Air draft here is worth measuring rather than remembering, with the antenna up and whatever you added last season still on the hardtop.
NOAA publishes 351 tide prediction stations inside this box. The density is not padding. At Pine Channel on Big Pine Key there is a station for the north side of the bridge and a separate station for the south side. When the agency that publishes the predictions treats the two ends of one span as two different places, it is telling you something about how water moves through the cuts down there.
The same idea runs the length of the coast in other forms. Alligator Reef has its own station out in Hawk Channel and Adams Key has one at the south end of Biscayne Bay, so the ocean side and the bay side are never asked to share a curve. Bahia Honda Channel and Newfound Harbor Channel each get their own. Bakers Haulover Inlet is listed specifically as inside the inlet. At the north end the stations sit well in from the ocean and read as river stations: Amelia City on the South Amelia River, Beach Creek at the Cumberland Island entrance, and one named only as three miles above the A1A highway bridge, which tells you that distance along the river was the thing worth recording.
Helm reports the tide as a NOAA prediction corrected by the residual at the nearest live gauge, labeled with where the figure came from. How much that correction is worth depends on how near the nearest gauge actually is, and with 351 stations inside this region it is usually on the same piece of water you are sitting on. Routing still computes at chart datum, so the tide figure tells you how much easier the hour is than the worst water of the day rather than deciding whether the passage goes.
These counts describe what the chart pack carries, not the state of the water today. Charted data ages, channels shoal and marks move. Keep a lookout and verify locally.
It covers the whole east side in one download, from the Amelia River at the north end through Biscayne Bay and out along Hawk Channel into the Keys, built from 242 NOAA ENC cells. The lower Keys cuts are in it with their own tide stations, including Bahia Honda Channel, Pine Channel, Big Spanish Channel and Newfound Harbor. The Gulf side of Florida is a separate pack.
Yes. This pack carries 1,784 bridges, the second highest count of the eighteen US regions, each with the charted vertical clearance from the ENC, read against the air draft you enter. An opening bridge is checked in its down position rather than treated as open sky. The 800 overhead cables on this coast are carried the same way, and they are the ones you cannot judge by eye on approach.
The chart's own figures for the 1,206 dredged areas in this pack run from 0.4 m to 15.8 m, with a median of 10.2 m, roughly 33 ft. The range is that wide because the same label covers a deepwater port approach and a shallow cut, so the figure attached to the specific area you are entering is the one that matters. Helm reads that depth per area and tells you when it came from the chart rather than from a recent channel survey.
Helm Boating