The LX-i is a handheld unit for checking depth. It works great. Keep it warm tho or it wont work worth a darn. The VX-1 is the new marcum unit that retails for $230 or something like that. I got one for 200 during the rebate sale on it. It is great, it has a good zoom but its not adjustable like the LX-5. It doesnt get interfered much by other units either. If you are actually talking about a LX-1 i havent seen it and would like to see a pic of it!!