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Simrad autopilot, linear feedback

Old 11-10-2016, 12:35 AM
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Default Simrad autopilot, linear feedback

I'm not very familiar with modern auto pilots. A quote for my electronics package includes a linear feedback LF3000 and I understand that it can be done without that device.

Please help me understand the pros and cons of that versus the "virtual feedback?".

I think I'm doing the NSS 12 evo2 with 4G radar, Simrad autopilot with either the AP 24 or the new AP44 controller and a Garmin GPSMAP 5x7 which will be primarily used as a bottom machine and backup the Simrad plotter.

I'm pretty set on the two main machines ( the dash has already been built ), I like the redundancies of plotters and software from two different suppliers and I like the lower power consumption of the Garmin which will be left on while at anchor.

I don't want too much clutter on my main plotter and plan to use it primarily for just radar / plotter ( and as a bottom machine when I'm trolling ), it will have a B 60 transducer and a total scan transducer mounted on the bracket ( these are things that I'd like to get feedback on ).

My plan for the transducer for the Garmin was the Aimar P79 ( 600 W in-hull ) but maybe I'd be better off with the B150 M ( 300 W chirp).... I guess I'd appreciate feedback on that idea as well.

Most of the trolling is done in the 15 to 40 fathom range ( with the downrigger weights at 20 fathoms or less ) and I do a lot of pot fishing ( shrimp pots & crab pots... I know what you were thinking ) in the 40 to 70 fathoms range, I don't have much need for bottom detail beyond that. I'd like to think that the total scan transducer hooked to the Simrad would be good at seeing the downrigger weights and fish will trolling and I'm guessing that the 600 W in-hull 50/200 will perform similar to the entry-level chirp in the 40 to 70 fathom range but please correct me if I'm wrong.
Thank you, Gerald
Old 11-10-2016, 12:38 AM
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From the sounds of it you have inboard power, that and how you use your boat a linear feedback would be the way for you to go for the best performance out of your system.

VRF is best for outboard powered boats.
I think you would be better with a b75m transducer at 600 watts which will definitely outperform the b60
Old 11-10-2016, 12:42 AM
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Thank you sir, I meant to include that the power is a 250 horse Tohatsu
Old 11-10-2016, 12:44 AM
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Then you should be using the VRF
Old 11-10-2016, 08:34 AM
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Originally Posted by InternationalMarineBrian View Post
Then you should be using the VRF
The LF 3000 is designed to be attached to an outboard and from my research I see that the use of it will give you a rudder angle on the multifunction screen and with the VRF you won't have that. I'm not particularly concerned about having a rudder angle but is there anything else that favors the linear feedback?
The B 75M is somewhere around $700, do I really need that?
Gerald
Old 11-10-2016, 09:18 AM
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Originally Posted by commuter boats View Post
The LF 3000 is designed to be attached to an outboard and from my research I see that the use of it will give you a rudder angle on the multifunction screen and with the VRF you won't have that. I'm not particularly concerned about having a rudder angle but is there anything else that favors the linear feedback?
The B 75M is somewhere around $700, do I really need that?
Gerald
When I upgraded from my Simrad AP11 (required linear feedback ) to the AP24 (which can use VRF or linear feedback ) I kept the linear feedback in place to test it against the VRF. I found no real difference in autopilot performance using the VRF vs. linear feedback sensor. I subsequently removed the linear feedback sensor and just went with the VRF.
Old 11-10-2016, 09:31 AM
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Go with the VRF it will clean up the transom and one less thing to get broken!
Old 11-10-2016, 09:32 AM
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Originally Posted by pulp friction View Post
When I upgraded from my Simrad AP11 (required linear feedback ) to the AP24 (which can use VRF or linear feedback ) I kept the linear feedback in place to test it against the VRF. I found no real difference in autopilot performance using the VRF vs. linear feedback sensor. I subsequently removed the linear feedback sensor and just went with the VRF.
Thank you sir, the type of thing I was hoping to hear

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