Having just acquired a HB Helix 5 SI GPS I am interested in a Lakemaster Chip for it. Luckily I mentioned this to a knowledgeable friend - mrdux - and he warned me to make sure I get a version 2 or 3, as the version 1 chips are extremely lacking in detail especially on Barkley Lake. Checking EBay I found many vendors (stores) selling version 1 chips for full price. I have a bid in on a version 2 from a fellow who upgraded to version 3s in both his HBs.