Electronics question

1. Correct. The transducer is where the depth/image is produced. 2. Depends on what you want. Since you are not side-imaging, you can mount a transducer on the TM itself (this is what I am using) if you want the depth at that point. You can glass-in a transducer in the front of the boat if you can find access to the point where you want to take the depth reading.2008 Pantera Classic2014 Mercury Pro XS 200

Normally the transducer on the jackplate is for the helm and there should be a transducer glassed into the hull (most of the time under the floor drain). It is not difficult to add another transducer to the foot of the troller. You put a clamp on the transducer and route the wire up the shaft and over to the bow fishfinder. Judd Lasiter

The front transducer is located midways between the console and bow recess. That rear one is the console unit unless ordered differently. BCB

Well, if its working well, I know I much perfer to see right under me when Im at the front of the boat. But as far as detail and noise, Im not sure. I know theres negatives with having a external transducer on the TM. My old boat I cut the cable pulling up the motor (probaly due to sloppy cable management during instal). Ive heard, but havent expierenced a problem, electronic interferance with the TM. Also, if you hit stumps it can really mess-up your transducer. I think there are good workarounds for those proplems but if you do it Id pay attention to them.

The NAV will have the better mapping. Also register the unit and look for down loads, Hummingbird released a software upgrade last week to add HD downscan to the units. It took about 5 minutes to download the update to the PC, copy to SD chip and upgrade unit.

If your 727 can work with humminbirds Interlink box and get GPS data from the 798 ( I think it can) it will be just fine unless you want color. By Interlinking these two units you can reference (shared) waypoints on both units. This works great if you are structure fishing. For the more intense tournament fishing anglers some are adding SI units up front. However, it is not mandatory at all. Any bow mounted unit that can be interlinked will be enhanced. One other consideration. GPS capable units can display shared waypoints but they do not have map referencing to display. Having shore line maps does make it easier. Although , to put your electronics question in perspective my partner and I lead our tournament trail (88 boat field) most of the year out of my 2008 regular Sabre with 797cSI and 787c bow mounted sonar (no mapping) until I upgraded my boat to a PIV during the end of our season.