[mkgmap-dev] [PATCH] Alpha code for Highway Symbols

Tue Apr 7 12:04:24 BST 2009

On Mon, Apr 6, 2009 at 6:47 PM, Toby Speight <T.M.Speight.90 at cantab.net> wrote:
> Do we have the encodings somewhere?  I got my values from the
> GroundTruth manual page:

The initial information I found was in the Garmin IMG format document:

  http://sourceforge.net/projects/garmin-img/

However this document only lists the 6-bit encodings.

The most complete document which I found was the cGPSmapper manual:

  http://cgpsmapper.com/manual.htm

This document lists eleven codes, and gives both the 6-bit and 8-bit
values. (There are nice pictures too.)

For example, the large highway sign is ~[0x2d] in 6-bit and ~[0x04] in
8-bit. There are also codes for US highway symbols; apparently these
labels can only be numeric, which presents another challenge for
anyone wishing to implement these signs.

Cheers.