This project is one of the public services provided by

The NOAA Nautical Chart Map displays authoritative data from GIS (Geographical Information System) servers operated by NOAA and other government agencies. Each time you open the map the most recent data that is hosted on those GIS server(s) will be displayed on your screen.

Be patient. Sometimes it may take a few seconds for GIS data to appear on the map. It all depends on how much other work the GIS servers are trying to do at the same time.

Everyone is welcome to share and repost this map link. There is no need to ask first. Please follow these simple rules:

1. Encourage your readers to click the "Map Tips" link in the upper left corner so they can learn how to get the most benefit from the map.

2. Include in your post a credit thanking

3. If you are news media or a government agency, please use the 'Contact' link near the top of this page to send me a link to where you are using the map. I enjoy knowing where the map is being used.

4. Unless you are news media, do not use this map link for any commercial purpose.

In case you found this page by an internet search, here is the link that will open the NOAA Nautical Chart Map. You can zoom out and drag the map to other locations or click/tap Menu > Search.

There are two basemaps that display the nautical charts with different symbology. The basemap 'NOAA_marine_chart' uses the traditional symbols. The basemap 'S57 NOAA marine chart' uses a newer symbol set that is supported by international agreement.

Open the map long link:,-80.870361&zoom=7&basemap=NOAA_marine_chart&overlay=AWOIS_obstructions,ENC_wrecks,AWOIS_wrecks&data=

Open the map short link:

The map is displayed by GISsurfer which is a general purpose web map that is based on the free open-source Leaflet API (Application Program Interface). It can be used by anyone for any non-commercial purpose. Providing this web map software is a public service and part of my way to "pay it forward". Please note that by using GISsurfer you now have an obligation to do something yourself to "pay it forward" in your own way.

Here is a quick way to learn the most useful features of any GISsurfer map.
1. Open the GISsurfer homepage (
2. Click the big green "Menu" button and select "Help".
3. Scroll down a bit on the help page and read the "Overview" section.

GISsurfer will automatically display either a touch-friendly interface or a mouse-oriented interface depending on the type of device you use to open a map.

Many GISsurfer maps will have various GIS overlay layers that you can turn on/off and restack. You can click on the 'top' GIS overlay and see all the attribute data the GIS server has for the thing that you clicked. If the attribute data includes a link, then you can click that link for even more information. If you need help to understand what 'top' GIS overlay means, then please open the homepage and read the "Overview" section as described above.

As I add features to GISsurfer updates will be posted on the MappingSupport twitter feed and the GISsurfer Facebook page.

Usually each GIS server includes web pages with the legend for the various layers the server can display. Links to those web pages are below. If the legend page has information for more than one layer then you will need to match the layer number you see below in parenthesis to the layer number on the legend page. Don't be confused if the layer names below are slightly different than the layer names on the legend page.

Another way to see what symbol is used for an overlay layer is to turn the layer on/off a couple of times. The symbol used for that layer should be obvious. Note that some overlay layers might be defined on the GIS server so that they only display at certain zoom levels. You might need to zoom in or out for the data to display. And if the GIS server hosting the data is busy it might take more than a few seconds for the data to appear on the map.

CLICK HERE to see the legend for:

  • AWOIS wrecks (1-4)
  • AWOIS obstructions (6-9)
  • ENC wrecks (11-14)

CLICK HERE to see the legend for:
  • Shipping lane and regs (0)
  • Coastal maintained channel (1)

CLICK HERE to see the legend for:
  • 12NM territorial sea zone (1)
  • 24NM Contiguous sea zone (2)

CLICK HERE to see the legend for:
  • Tide, wind and more (4)

CLICK HERE to see the legend for:
  • Bouy (1)

CLICK HERE to see the legend for:
  • Ocean/Estuary/Lake observation (2)

CLICK HERE to see the legend for:
  • Weather watch warning (0,1)

The basemap button is next to the "Menu" button and always displays the name of the current basemap. If you click the basemap button then you can change the basemap and also turn the overlays on/off. Mobile uses will need to tap the basemap button and then scroll down to the "Overlays" section.

There are two basemaps that display the nautical charts with different symbology. The basemap 'NOAA_marine_chart' uses the traditional symbols. The basemap 'S57 NOAA marine chart' uses a newer symbol set that is supported by international agreement.

As you change basemaps and turn overlays on/off, remember that it may take a few seconds (or longer) for the data to appear on your screen. The response time varies based on how busy the server is that is hosting that data. The bandwidth and congestion of your internet connection is also a factor.

If you want to turn on an aerial basemap then "ESRI aerial clarity" is usually the best quality. Also when you turn on an aerial basemap then consider also turning on the overlay "ESRI roads and labels".

Click the basemap button to see the list of overlays. Click an overlay name to turn it on. Click it again to turn it off.

An overlay name with a number in front is 'on'. The highest numbered overlay is 'on top' and can be clicked to show all the attribute data the GIS server has for the thing that you clicked. Sometimes the attribute data includes links that lead to more information.

The attribute display also includes a link titled "Visit GIS server". That link will display a page from the table of contents for the GIS server. If you open that page then look at the heading "Service Description". Sometimes you will see useful metadata.

If the map is displaying several overlays then you can move any overlay to the 'top' by turning it off and then turning it back on.

Remember - only the 'top' overlay is clickable. Also the order with which you turn on various overlays can greatly affect the appearance of the map. Each time you turn an overlay on it is displayed 'on top' of any overlays that are already on.

If you have trouble seeing data on the map then you can change the basemap to "All white basemap".


Almost anything that GISsurfer can display can be viewed as an offline map on both iOS and Android devices. These offline maps are for non-commercial use only. The maps include geolocation and you can turn on the MGRS, USNG or UTM grid.

These offline maps are not available in any app store. Instead the documentation for how these maps are produced and installed is on the GeoJPG website. Below is an overview.

GISsurfer has a feature (Menu ==> GeoJPG screenshot mode) that lets the user (1) remove all controls and text from the screen and (2) shift the screen exactly one screen worth up/down/left/right. This makes it super easy to take a series of screenshots that exactly adjoin. You can make these screenshots with any device, from a cell phone to a desktop computer.

A group of screenshots can be viewed offline as a seamless map. A group of screenshots can also be stitched together and the resulting large image viewed offline as a map. All the necessary georeference data is provided.

There are three ways to get georeferenced JPGs that you can install and use as offline maps.
    1. Some georeferenced JPGs are posted on the GeoJPG website.
    2. You can also use the GISsurfer recreation map links to display trail maps for any national forest, national park or BLM land. Display the area that you want to see offline and then make your own georeferenced screenshots. Yo find these map links, open any GISsurfer map and then click Menu ==> Recreation maps.
    3. Find any GIS data that you would like to see on an offline map. Use GISsurfer to display that GIS data and take georeferenced screenshots. In other words, you can make your own custom offline maps and are not limited to map tiles made by someone else.

To help you find GIS data that you would like to see on an offline map you can use this curated list of addresses for 3,000+ ArcGIS servers. Most of these addresses are for government GIS servers at all levels from local to federal.

In summary, three projects by MappingSupport combine to provide a first-of-its-kind way for anyone to make their own custom offline maps that can display a nearly limitless variety of GIS data. Those projects are:
    1. ArcGIS server list to find data.
    2. GISsurfer to make georeferenced screenshots that exactly adjoin.
    3. GeoJPG to view those screenshots as an offline map.

For full documentation please visit the GeoJPG website.

Here are two pages from the GISsurfer website that have links to other interactive recreation maps. Each map can display multiple overlay layers of data that are hosted on government GIS servers.

National park maps

USFS, BLM and NOAA maps

You can use these maps to make your own custom map that will work offline on iOS and Android devices. For more information see the GeoJPG website.

This is a consulting service I offer. Each client receives a map link that will display the google aerial and the approximate property lines for the client's land. A geolocation symbol can be turned on to show the user's location.

Each map is custom made using software I developed to process either a land survey or property legal description provided by the client. As a result, these maps will almost always be more accurate than the county GIS parcel data.

One common use is to help find survey stakes at property corners. This map will get you close. For more information, please see either website.

Mobile user:
Desktop user:

One of the main features of GISsurfer is its ability to display data that is hosted on government GIS (Geographical Information System) servers. The link below will display a curated PDF file with the internet address for 3,000+ government GIS servers. These are at all levels of government from federal down to city. Each link is scanned by my code once per week and any bad links are either fixed or flagged. An updated list is usually posted every Wednesday.

Assume you are outside somewhere, something bad happens and you need to contact 911. Since you are not at a street address, the fastest way for you to get help is to give the dispatcher your (1) latitude longitude in decimal degrees and (2) the equally important accuracy value for those coordinates. Dispatchers are very familiar with coordinate data in this format.

When you call 911 with your cell phone the wireless carrier handling your 911 call is supposed to produce reasonably accurate coordinates for you and make that data available to the 911 dispatcher. In 911-speak these are called "phase 2" coordinates. For various reasons the "phase 2" coordinates for a cell phone caller are sometimes never produced by the wireless carrier or have terrible accuracy.

Are you curious to know why wireless carriers sometimes do not provide 911 dispatchers with good "phase 2" coordinates? I was too! So a few years ago I did a deep dive into documents on the FCC website. Below is a link to a PDF report I produced that will tell you what I learned. Anyone who reads the report will likely be convinced that it is *critically important* that everyone have an easy way to use their phone in a stressful emergency to display their coordinates (latitude longitude in decimal degrees) *and* accuracy value.

Open PDF report describing problems with "phase 2" coordinates:

Yes, some 911 call centers have additional technology such as RapidSOS that might be able to produce coordinates for you when the "phase 2" coordinates fail. But instead of betting someone’s life on the assumption that the 911 call center has some tech that can generate accurate coordinates for you, a much better plan is for you to give the dispatcher your (1) latitude longitude in *decimal degrees* and (2) the equally important accuracy value.

If you want to use the FindMeSAR webpage ( I developed, great. This project is a public service and part of my way to "pay it forward". FindMeSAR uses the GPS in your phone to display your coordinates and accuracy value. See near the end of the above PDF file for more information about FindMeSAR. But if you have some other way to easily display your coordinates and accuracy in a stressful emergency, that is fine too. The point here is that everyone (spouse, kids, crazy uncle Harry, etc) should have some easy way to display their coordinates and accuracy value if they ever need to call/text 911.