Convert BSB to MAP

Understanding BSB and MAP file formats

BSB files are raster nautical chart files commonly used in marine navigation. They are part of the BSB/KAP format, which stores scanned images of nautical charts along with georeferencing information. These files are widely used in navigation software and chart plotters.

MAP files, in the context of mapping and navigation, often refer to OziExplorer MAP files. These are plain text files that contain georeferencing data for raster map images, allowing navigation software to correctly position the map image on the earth's surface. The MAP file itself does not contain the image, but rather the calibration data for a corresponding image file (such as a JPEG or PNG).

Why convert BSB to MAP?

Converting a BSB file to a MAP file is useful when you want to use nautical charts in software like OziExplorer or other mapping applications that require MAP calibration files. This process typically involves extracting the raster image from the BSB file and generating a corresponding MAP file with the correct georeferencing information.

How to convert BSB to MAP

The conversion process involves two main steps:

1. Extract the raster image (usually as a PNG or JPEG) from the BSB file.
2. Create a MAP calibration file that matches the extracted image.

Recommended software for BSB to MAP conversion

The best software for this conversion is OziMapConverter or MapCal (OziExplorer's calibration tool). Here’s how you can do it:

• OziMapConverter (free, Windows):
  1. Open OziMapConverter.
  2. Load your BSB/KAP file.
  3. The software will extract the image and generate a MAP file automatically.
• OziExplorer (Windows):
  1. Use File → Import Map → BSB/KAP Map to import your BSB file.
  2. OziExplorer will create a MAP file for use with the extracted image.

For Linux and Mac users, GDAL (Geospatial Data Abstraction Library) can be used to extract the raster image, but the MAP file must be created manually or with additional tools.

Tips for successful conversion

• Ensure the extracted image and MAP file are in the same directory for proper calibration.
• Double-check georeferencing points in the MAP file for accuracy.
• Always use the latest version of your chosen software for best compatibility.