Topic: gps fishfinders
Wherever you fish, programming a trolling system comes down to several basic variables. Put them all together in the right combination and you are almost guaranteed success. Trolling is not a lazy man's method of fishing. It takes know-how and experience and lots of persistence, but when done correctly can produce fantastic results.
Getting your lure to the correct depth is the single most important aspect of successful trolling. The depth of a trolled lure depends on several factors, the first of which is lure design. Lures with large diving lips go deeper than those with small lips or no lips at all. Lures made with a high density metal or plastic go deeper than buoyant plugs made with wood or hollow plastic. If you're fishing deep water you'll want to go with the larger lips or weighted plug. On the contrary if you are fishing shallow water you'll want to opt for the floating lure with a small diving lip.
A second factor in programming your trolling is line length. The farther back your lure is from the boat the deeper it runs. A plug that reaches only ten feet when trolled back one hundred feet may go to 15 feet at 150 feet back and to 20 feet when you let out 200 feet of line. These depths are more pronounced when leadcore line is used. Most bass taken by trolling are caught near bottom structure, so accurately controlling your depth by controlling your line length is very important.
Determining the amount of line you need to have out can be managed while using a Lowrance GPS or Raymarine fishfinder. These electronic devices will display accurate images of the water's bottom and help guide your trolling efforts.
Line diameter and density are also factors in lure depth control. Thinner lines are less buoyant and usually reach a greater depth for a given line length and lure design. Thin lines penetrate the water easily, so light test lines are generally good choices for deep water trolling. However, the thin lines also have it's disadvantages as being easily broken when your lure hangs on a snag instead of a bass. You may want to consider carrying a plug retriever in your fishing gear.
Adding weight to your line is another way controlling depth. Twist-on sinkers or split shot can add several feet to your lures running depth. Leadcore lines also add depth but they are expensive and tend to twist and snarl after a day of trolling.