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How many points?

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Jig Man:
I'm having the point 1 gps antenna put on my new boat.  The dealer says use 2 instead of 1.  Anyone have any ideas on this.

Nightmare:
Kinda makes a difference what you want to do, I think.

It's the fastest refresh rate option but that's not gonna make a lot of difference up front cause the troller ain't gonna outrun any of the rates so the internal antenna is good there. For marking a spot as accurately as possible, your bow unit with internal antenna is gonna be darn close over top of the front transducer and what I mark from up front usually relates to something I'm marking on the bottom so again,  I don't see needing an external for that.

With the console unit, the refresh rate might make a difference for the go-fast rigs. An external can be placed at least 5 feet closer the the rear transducer that the console but my understanding is the standard for that placement is up behind the driver seat on the rear deck because of distance recommended from magnetic mass, both metallic and electrical (engine and charging system).

It will have to be calibrated once installed.

I don't see advantage for 2 of 'em but that's according to my use. Your mileage may vary. Refresh is main plus but I'm not aware of accuracy advantage.
 (shrug)

Jig Man:
That is my thinking but the dealer who is doing all of the install says he runs it this way and it is just plain better.  I'm not sure he is accurate with his thinking but surely it won't make anything worse and he is giving me all of the electronics at a way better price than I can buy them anywhere else.

Nightmare:
You might be getting a good price (nothing wrong with that) but you're the one gonna have to keep 'em playing well with the whole system. Still gonna cost 2x in the pucks plus additional nmea components.

No expert here - don't have the external pucks myself. Doesn't fit my own bang for the buck requirements, is all.

bullet20dc:
Gimick envy is all it is.  Its new everybody has it I gotta have it.    If You need to know where a waypoint is to the millimeter  then Ya got issues.   I never found that the built in wasn't good enough in accuraccy to find what I was looking for .   You prob are gettin a great deal but its still money going the wrong way from your wallet

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