This will be dependent on the product that you own. Below are links to PDF files for a few different products with internal GPS receivers.  


For the 161 Combo, 363 Combo and the 383C Combo .

For any HELIX Series product with GPS, the 11x9ci, 9x9ci, 8x9ci Series , 787c2i, 788ci, 797ci SI and the 798ci SI.