The angle between the magnetic and geographic (true) north at a location, expressed in degrees east or west from the direction of true north.
S-57 Object Class: Magnetic variation
S-57 Acronym: MAGVAR
This data was compiled for the use in the scale range 1:4,000 to 1:22,000.
THIS DATA DOES NOT REPLACE NAUTICAL CHARTS AND MUST NOT BE USED FOR NAVIGATION.
This data is based on the S-57 data format used in Electronic Navigational Charts (ENCs) published and maintained by the New Zealand Hydrographic Authority at Toitū Te Whenua Land Information New Zealand (LINZ). Refer to the following link for information about S-57 data: http://www.linz.govt.nz/hydro/regulation/
The hydrographic data available through the LINZ Data Service is based on official Electronic Navigational Charts (ENCs) published by the New Zealand Hydrographic Authority.
Prior to loading onto this service, the S-57 data from these ENCs is converted to shapefile format.
The following Navigational Purposes and scale-ranges are represented: 1. Overview, 1:1.5mil and smaller 2. General, 1:350k - 1:1,500k 3. Coastal, 1:90k - 1:350k 4. Approach, 1:22k - 1:90k 5. Harbour, 1:4k - 1:22k