Brian—Experience has taught the value of redundancy in electronics. I run two boats. Both have Lowrance LCR’s on the dash and Vexilar flashers in the bow. My GPS is a separate unit…for at several reasons.
1.You can plug in waypoints when fishing out of somebody else’s boat
2. hand held unit can be used to find the same spots thru the ice
3. if your sonar/GPS goes down you’re not out of business.
Since I can only fish out of one boat at a time, if a unit in the boat I use goes down I still have a compatible backup and can be back at guiding/fishing the very next day at the latest.
Also, if a multi-function unit goes down it is generally tougher to trouble-shoot the problem because of complexity.
Regardless of what you decide to do, be sure to include a good marine compass as part of the package…and don’t forget to fuse your electronics close to the power source…with back-up fuses in the boat.
A couple more tips…
* use a quality fuse holder
* if you have a power problem, check the connection at the back of the unit, then at the battery…and then REMOVE the fuse and touch both ends of the fuse holder together. If you get power it is the fuse, if not it’s another problem.