One off Purchase
A “one off purchase” license is a permanent license with no time limitation. Permanent licenses are only available for Professional and Professional+, not for ENC. It is often used for systems not being used for navigation, like offices, vessel tracking, survey etc. A “one off purchase” requires a license given to one particular issue of the database. This means in effect that no future updating service applies. A newer database version (updating) will require a new license.
Contrary to a “one off purchase” license, a subscription license last for a certain period of time, usually the current month + 12 months. A subscription license will prior to expiration warn the mariner with a message in the ECDIS that it needs to be renewed. A subscription license is not depending on the version of the database. A new chart database is sent to the ship on a regular basis. In addition, corrections (NTM) can be downloaded via email or our website.
From 1993 to 2003 all C-MAP charts to the professional high seas market was supplied on CD-ROM. In 2003 the amount of charts and supplementary information in the C-MAP Professional+ database, like sea-routes, tide tables, etc had reached a volume that exceeded the storage capacity of a CD-ROM. Therefore a long and painstaking process to get manufacturers to move from CD-ROM drive to DVD drive in their ECDIS started.
With slightly more than 90 different manufacturers offering C-MAP products it has been (and still is) quite a process to get all of them to move from CD to DVD. Only a very few are still providing CD drives.
Therefore in order to distinguish between these two databases, the one supplied on DVD was named C-MAP Professional+, while the one supplied on CD-ROM kept its original name; C-MAP Professional.
PS! Both are of course subject to updating with new charts and NTM’s. Difference is only that the C-MAP Professional doesn’t contain supplementary information and must be kept limited with number of charts.
ENC are vector charts issued by Hydrographic offices. These are made in S-57 format and mostly supplied in IHO encryption format S-63.
The S57/S63 format is first and foremost designed to exchange data between computers.Before it can be finally stored into an ECDIS computer it must be converted to the ECDIS internal System ENC (SENC) format.
C-MAP provides SENC format to more than 90 manufacturers, which of 25 makes a type Approved ECDIS. The compilation and verification from ENC to SENC is being performed by C-MAP before the final SENC product is sent to the ship.
It is preferable that this process takes place in a controlled environment and by experts as the S-57 data format specifications can be interpreted differently and therefore there is a risk of using non-compliant data. This data should not be accepted into the ECDIS, as it could cause malfunctions, incorrect information or, in the extreme case, cause the ECDIS to crash.
A further advantage of SENC distribution is that the navigator on-board does not have tospend considerable time and patience required to convert the ENC's to the SENC, a process that requires the ENC to be 100% compliant. ENC supplied in SENC format simply requires to insert the DVD/CD and by well-known Windows technology: “Copy and Paste”.
A further advantage of SENC distribution is that the navigator on-board does not have to spend considerable time and patience required to convert the ENC's to the SENC, a process that requires the ENC to be 100% compliant. ENC supplied in SENC format simply requires to insert the DVD/CD and by the well-known function “Copy and Paste” the entire database is being installed in less than five minutes.
The distribution of ENC in SENC format has been approved during the Athens CHRIS meeting in April 2002. Most HO's admit that it simplifies access to official digital cartography, and it does not affect on IMO performance.
Please advise whether we are required to update both systems independently even though they are connected by LAN? If this is the case, we will have to send TWO Update Order Files? kindly advise.
Even though the two ECDIS are connected via LAN, this is basically to share information, internal exchange or from different sensors like GPS, Gyro etc.The Chart databases are however individual and not shared through this LAN. Therefore they must be updated individually (one by one) with both new DVD and Online (NTM's)