Go Free Wireless Toolkit
The GoFree open protocol data strategy groups data into 5 different Tiers. Access to data varies, but essentially all data is free to use if it enhances the desirability of Lowrance MFDs.
Specifications for Tier 1 and Tier 2 (view only) are available to download for free - follow the links below. Any developer wishing to use Tier 2 control or Tiers 3 to 5 should contact firstname.lastname@example.org with a proposal. Support for Tiers 2-5 will be included in the Lowrance HDS RTM2 Software release, available from late 2012.
For more information on the GoFree Developers Toolkit, or for access requiring development tiers 3-5, please contact Lowrance at email@example.com.