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NTM Help - How to use Maptech's Professional Notice To Mariners Service

Created: 12/12/2003
Modified: 08/02/2005

DISCUSSION

Glossary of Terms Used in this Document
Chart Patches and Chart Editions
A chart patch is a small computer image that can be electronically painted on top of an existing raster chart, to update or correct it. For example, water can be painted on top of a buoy symbol to remove the buoy from the chart, if the buoy has been removed from the water. Or, a buoy symbol can be painted on top of water, to add a buoy. (Removing a buoy in one location while adding another buoy symbol elsewhere has the same effect as moving the buoy location on the chart.)

There are two important things to remember about chart patches. First, chart patches may only be applied to specific chart editions. (An electronic Chart Edition always corresponds to the latest paper chart printed by NOAA.) Second, chart patches store changes cumulatively. This means that to bring a chart completely up to date, you need only apply the latest patch, even if there have been several patches since you last updated that chart. The most recent patch contains all previous changes.

NCE Updates
NCE stands for New Chart Edition.

NCE Update Patches are used to replace an old Chart Edition with a new Chart Edition. This happens whenever NOAA prints a new paper chart. When a new chart is printed, the old paper chart and corresponding old electronic chart become obsolete. When NOAA prints a new paper chart, Maptech makes a corresponding electronic New Chart Edition, compares it to the old electronic chart, and makes a chart patch that reflects the difference between the two. This type of patch is referred to as a New Chart Edition (NCE) patch. Applying the New Chart Edition patch to the old electronic chart has the effect of updating it to the New Chart Edition.

NTM Updates
NTM stands for Notice to Mariners.

NTM Update Patches are used to update an existing Chart Edition with Notice to Mariners corrections. This type of correction occurs between paper chart printing cycles. Notice to Mariners corrections are published by the US Coast Guard, the National Imagery and Mapping Agency, and the Canadian Hydrographic Service. NOAA cartographers collect the various Notice to Mariners documents, interpret the documents for changes, and apply the changes to existing Chart Editions. Note that temporary notices or corrections are not made to the charts. When NOAA makes a Notice to Mariners correction to an existing Chart Edition, Maptech makes the corresponding Notice to Mariners (NTM) correction patch. Applying the Notice to Mariners patch to your electronic chart incorporates the Notice to Mariners corrections. (Notice to Mariners correction patches may also contain additional critical corrections that are published by NOAA, but not found in any printed Notice to Mariners publications.)

Static Correction (NTM)
NTM (Notice to Mariners) corrections are changes made to charts to bring them up to date. There are two ways to apply NTM corrections: Static Correction, or Dynamic Correction.

During static correction, a new chart file, containing the latest NTM changes, is created from the original chart. This new version is what you will see when you use your navigation software.

The original edition is retained, since it still represents the most current paper chart available from NOAA. When NTM changes are released, they must be applied to the most current paper chart edition. Therefore, for each chart area that has been updated, you will have two editions: the original, and a revised edition with the latest changes. Whenever you apply NTM updates, a new revised edition replaces the last revised edition. The original remains the same, and is used as a basis for creating the revised charts.

Dynamic Correction (NTM)
NTM (Notice to Mariners) corrections are changes made to charts to bring them up to date. There are two ways to apply NTM corrections: Static Correction, or Dynamic Correction.

If your navigation software is able to perform dynamic correction, NTM changes are applied to a chart when you choose that chart to view. (No new chart files are created.)

Dynamic correction provides more convenient and flexible chart viewing. With a dynamically-corrected chart, you can toggle the NTM changes on and off, to see what is new on a particular chart. Dynamic correction also uses less room on your hard drive, since it does not require the creation (and storage) of entire new chart files.

Cleared Date
The date through which NOAA cartographers have cleared the chart as being up-to-date. If the Cleared Date is more recent than the Revision Date, no additional changes are necessary during the period between the two dates.

Installing a Notice To Mariniers Update
Select Install Option:
This Maptech-NOAA Chart Update Program will install updates on your hard drive. You may choose either a Full Install, or a Quick Install.

-If this is the first time you have used this chart update program, you should select Full Install. This is a step-by-step process that will let you make the necessary specifications for storing and applying these chart update patches. A Full Install takes approximately 15 to 20 minutes.

-If you have used this update program before, and have previously performed a Full Install, you may choose Quick Install now. During a Quick Install, the update program will automatically use the same settings that were used the last time you updated your charts. (In other words, you won't be asked where to store patches, what to archive, etc.). A Quick Install takes approximately five minutes.

Whether you choose Full or Quick Install, you will need to have your ChartKit Professional CD-ROM ready.

Step 1: Install Chart Update Patches
The first step in this update program is to Install Chart Update Patches.

Patch files contain the changes that need to be made to your charts in order to bring them up-to-date. Before these patches can be applied, they must first be installed on your system.

There are two kinds of Chart Update Patches:
New Edition Chart Update Patches (NCE):
When a new version of a paper chart is printed by NOAA, Maptech creates a corresponding updated electronic version of this chart. These new chart editions are contained in NCE patches (NCE= New Chart Edition). Running an NCE patch essentially creates a new chart, with all the latest changes on it, to take the place of the old (obsolete) chart edition. .

Notice to Mariners Chart Correction Patches (NTM):
Between reprintings, NOAA makes occasional corrections to an existing chart. These corrections are contained in NTM updates. When these updates are applied, the chart itself is not replaced, but rather is updated with the appropriate corrections.

Here in Step 1, both kinds of patches will be copied to your hard drive, so that you can apply the changes that they contain.

Select Chart Update Destination Directory
Before patches can be applied, they must be copied to a location on your hard drive. This location is called the Chart Update Destination Directory. By selecting a chart update destination directory, you specify where you want the patches to be stored.

If you have no preference, you can leave the settings as they are and use the default directory shown, and just click Next to move on to the next step.

If there is a particular directory location where you want to store the patches, click the Browse button to specify a different directory.

"Space Required" is based on the number of Chart Update Patches to be installed. This is the estimated amount of space that the patches will take up on your hard drive. If the "Space Required" number is larger than the "Free Disk Space" number, then you need to make some room on your hard drive. Click the Cancel button to exit this update program, and refer to your Windows User Manual for suggestions on how to free hard disk space (try emptying your Windows Recycle Bin).

Select Archive Directory
When you run this update program, data is added to your hard drive (in the form of patches and new charts), and other data may be removed (outdated charts, for example). You can choose how much data to archive. Archiving stores data for backup or future reference.

Choose an Archive Option
There are three types of data that you may choose to archive:
Old Patch Files:
Containing previously applied changes (not the charts themselves). Old patch files could come in handy if you ever need to reinstall your charts.

New Chart Edition (NCE) Updated Charts:
Entirely new charts. These are electronic versions of newly-issued paper charts (for example, moving from Edition 1.08 to Edition 2.00). It is necessary to have these charts, in order to keep current with all the latest changes and corrections. Therefore, archiving NCE Updated Charts is required.

Notice to Mariners (NTM) Corrected Charts:
Revised charts (for example, moving from Edition 1.00 to Edition 1.01). These revised charts include occasional changes made by NOAA between reprintings of a particular chart area. You can archive these if you want to be able to look back frequently at previous changes for some reason, but it is not necessary to keep them.

You have three choices for controlling how much data is archived.
1. Minimal - Keeps NCE Updated Charts (Required)
2. Moderate - Keeps Old Patch Files and NCE Updated Charts
3. Full - KeepsOld Patch Files, NCE Updated Charts, and NTM Corrected Charts

If you aren't sure which archive option to choose, we recommend Moderate Archive.

Specify the Archive Directory Location
Next, select the directory where these older files are to be archived. If you have no preference, you can simply use the default directory shown, or you can click the Browse button to specify a different directory.

"Space Required" is based on the number of files to archived. This is the estimated amount of space that the archived files will take up on your hard drive. If the "Space Required" number is larger than the "Free Disk Space" number, then you need to make some room on your hard drive. Click the Cancel button to exit this update program, and refer to your Windows User Manual for suggestions on how to free hard disk space (try emptying your Windows Recycle Bin).

Patch Install Log
The Patch Install Log provides a list of the Chart Update Patches that were just installed on your hard drive. You can print this log by clicking the Print button. A copy of this log is stored in the Patch Destination Directory (where these patches are stored) for future reference.

Chart Number:
The NOAA chart number to which an NTM chart update applies. This chart number corresponds to the printed NOAA paper chart.

Source:
The name and directory location of the Patch File Archive (PFA) being installled. (The PFA contains compressed patch files, which have been uncompressed and copied to your hard drive.)

Patch Destination:
The destination directory where the patch files have been copied.

Patch Archive:
The destination directory where old patch files will be archived (if you have chosen Moderate or Full Archive option is selected).

Update Type:
There are two types of chart update patches. "NCE“ indicates an entirely new chart edition, corresponding to the release of a new NOAA paper chart. "NTM" indicates that the chart update patch contains Notice to Mariner corrections (to be made to an existing chart).

Source Edition Number:
The Chart Edition number to which this update applies. This corresponds to the number on the NOAA paper chart. For example, "34.00" means the update patch can only be applied to the chart edition number 34.

Revision Number:
The chart update number. For example, "34.08" represents the 8th chart update for NOAA chart edition 34. Any previous updates (34.01 through 34.07) are superseded by the new Update Patch (34.08).

Source Date:
The edition date of the electronic chart to which this update must be applied.

Last Updated Date:
The date of the most recent Notice to Mariners correction made to the chart by a NOAA cartographer. This correction was based on a Notice to Mariners published by the US Coast Guard, NIMA, or CHS, or a chart change issued by NOAA.

Cleared Date:
The date through which NOAA cartographers have cleared the chart as being up-to-date. If the Cleared Date is more recent than the Last Updated Date, no additional changes are necessary during the period between the two dates.

Step 2: Update your Chart Portfolio with New Chart Editions

Now that you have successfully installed patches on your hard drive, you must apply the patches in order for the changes to take effect on your charts. Here in Step 2, this update program will apply one of the two types of patches: the NCE (New Chart Edition) patches.

When NOAA reprints a paper chart, the older chart becomes obsolete. NCE patches will replace your out-of-date charts with new editions.

It is important to keep your chart editions up to date, because Notice to Mariners (NTM) chart corrections can only be applied to the most current chart edition. Therefore, applying these NCE patches now will ensure that you have the latest charts and are able to keep current with any future NTM changes.

Select Chart Destination Directory
Please select the directory where the updated charts are to be installed. If you have no preference, you can use the default directory shown; otherwise, click the Browse button to specify a different directory. (Note: you may not use your CD-ROM drive as a Destination Directory.)

The "Space Required" is based on the number of Chart Update Charts to be installed. If this number is larger than the "Free Disk Space" number, then you should click the Cancel button to exit this update program. Refer to your Windows Manual for suggestions on how to free up hard disk space (try emptying your Windows Recycle Bin first).

New Chart Edition Update Log
The New Chart Edition Install Log provides a list of the New Chart Editions that were installed. You can print this log by clicking the Print button. A copy of this log is stored in the Chart Destination Directory (where these charts are stored) for future reference.

Chart Number:
The NOAA chart number to be updated. This chart number corresponds to the printed NOAA paper chart.

Source:
The name and directory location of the Source Chart file being updated.

Patch:
The name and location of the patch file being applied to the Source Chart.

Update Destination:
The destination directory where New Chart Edition files will be placed.

Archive Destination:
The destination directory where New Chart Edition files will be archive (always required for New Chart Editions).

Update Type:
The type of chart update patch. "NCE" indicates a new chart edition corresponding to the release of a new NOAA paper chart.

Source Edition Number:
The Chart Edition number of the electronic chart to which this update must be applied. This number corresponds to the number on the NOAA paper chart. For example, "34.00" means the update patch can only be applied to the chart edition number 34.

Revision Number:
In the case of a New Chart Edition, this is the new chart edition number. For example, "35.00" means that this is NOAA chart edition 35.

Source Date:
The edition date of the electronic chart to which this update must be applied. This date corresponds to the Source Edition Number.

Last Updated Date:
In the case of a New Chart Edition, this is the new chart edition date.

Cleared Date:
In the case of a New Chart Edition, this is the same as new chart edition date.

Choose How to Apply NTM Corrections
In this final phase of the update program, you decide how to apply the NTM corrections to your charts. There are two ways: dynamic correction (apply NTM corrections while viewing charts), and static correction (create new charts containing NTM corrections).

Dynamic Correction
Dynamic correction makes for more convenient and flexible viewing options. With a dynamically-corrected chart, you can toggle the NTM changes on and off, to see what is new on a particular chart. Dynamic correction also uses less room on your hard drive, since it does not require the creation (and storage) of entire new chart files.

Static Correction
During static correction, a new chart file, containing the latest NTM changes, is created from the original chart. This new version is what you will see when you use your navigation software.

The original edition is retained, since it still represents the most current paper chart available from NOAA. When NTM changes are released, they must be applied to the most current paper chart edition. Therefore, for each chart area that has been updated, you will have two editions: the original, and a revised edition with the latest changes. Whenever you apply NTM updates, a new revised edition replaces the last revised edition. The original remains the same, and is used as a basis for creating the revised charts.

-If you use Maptech navigation software (Offshore Navigator or Offshore Navigator Lite) version 5.0 or higher, you should choose Dynamic.

-If your software does not support dynamic updating, choose Static.

(Refer to your software manual or Help documentation if you are unsure whether dynamic NTM corrections are possible.)

Step 3: Update your Chart Portfolio with NTM Corrections
You have chosen to apply the NTM Correction patches to your charts, using Static Correction. This will create new versions of these charts. Any older revisions will be replaced with these new revisions.

Note: You may skip this step if your navigation software supports dynamic correction. With dynamic correction, your navigation software automatically will apply the NTM changes to the chart image onscreen when you select a chart to view. Dynamic correction saves you time and hard drive space, by not requiring the creation- and storage- of entirely new charts. It also provides more flexible viewing options, allowing you to toggle the NTM changes on and off, so you can see what features are new on each chart.

If you use Maptech navigation software (Offshore Navigator or Offshore Navigator Lite) version 5.0 or higher, you should click the Back button to return to the previous window, and choose Dynamic. (Otherwise, consult your navigation software manual if your are unsure whether your software supports dynamic correction.)

Notice to Mariners Correction Log
The Notice to Mariners Correction Log provides a list of the charts that were updated (using the Static Correction option). You can print this log by clicking the Print button. A copy of this log is stored in the Chart Destination Directory (where these charts are stored) for future reference.

Chart Number:
The NOAA chart number to be updated. This chart number corresponds to the printed NOAA paper chart.

Source:
The name and directory location of the Source Chart file that was updated.

Patch:
The name and location of the patch file that was applied to the Source Chart.

Update Destination:
The destination directory where the NTM-corrected chart files have been placed.

Archive Destination:
The destination directory where older NTM-corrected chart files were stored (if you chose Full Archive).

Update Type:
The type of chart update patch. "NTM" indicates that the chart update patch contains Notice to Mariner corrections.

Source Edition Number:
The Chart Edition number of the electronic chart to which this update has been applied. This number corresponds to the number on the NOAA paper chart. (For example, "34.00" means the update patch can only be applied to the chart edition number 34.)

Revision Number:
The chart update number. For example, "34.08" means that this is the 8th chart update for NOAA chart edition 34. All previous updates (34.01-34.07) have been superseded by the new update patch (34.08).

Source Date:
The edition date of the electronic chart to which this update applies. This date corresponds to the Source Edition Number.

Last Updated Date:
The date of the most recent Notice to Mariners correction made to the chart by a NOAA cartographer. This correction was based on a Notice to Mariners published by the US Coast Guard, NIMA, or CHS, or a chart change issued by NOAA.

Cleared Date:
The date through which NOAA cartographers have cleared the chart as being up-to-date. If the Cleared Date is more recent than the Revision Date, no additional changes are necessary during the period between the two dates.





 


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