Are the internal GPS's just as good as the external antennas. What would be the good or bad(extra $100+) reasons for hooking up a external GPS antenna to a sonar that has already got internal GPS.
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Are the internal GPS's just as good as the external antennas. What would be the good or bad(extra $100+) reasons for hooking up a external GPS antenna to a sonar that has already got internal GPS.
Biggest thing is being able to mount external as close as possible to transducer. This allows to mark your way point closer to what you are reading off transducer. Say unit is 15 ft from ducer and you mark way point, that increases the distance by that much in all directions when your trying to get back on your waypoint. Hope that makes sense.
Buddy were both off more then 15ft. LOL But I agree, I always try to mount the antenna as close to the Transducer as I can get it. On my Helix 10 SI, the unit is mounted within 3ft so internal does not matter. But on my old 987C SI I had them 10 ft apart and getting on top of crappie beds was like trying to find a dollar in the middle of the interstate.
The internal hardware of the external antennas and the internal antennas are the same (of the present available HB GPS antennas) ...
Only the AS GPS HS antenna is different because of the added magnetic compass ...
Rickie
Thanks everyone for the answers to my questions. You all saved me some $$$.
Don't know about present day HB's, but I have a 788 ci (internal) and a 988 with external and the 988 is much better. I doesn't jump around on speed and path like the internal. Could be better processing but in MHO signal pick up with the puck is better. Accuracy.... hard to say.
988 should have a better processor then the 788. Or that was what I read I think.. Same as my Helix 10 SI and 987 SI the 10 is way better then the 987 was back in the day.
Pete
Didn't some earlier internal units use 13 channel receivers vs 25 channels ones being used now?
Sometimes you gotta stop and smell the brisket.
The discontinued AS GR 16 did indeed use fewer channels ...but I'm not sure of how many ... or if the "16" indicated the number of channels ...Quote:
Originally Posted by fishfried
Rickie
Question --doesn't the AS GPS HS antenna also read direction EX.--North, South,etc. so u can always know what side u are going over ur brush pile, logs etc.Quote:
Originally Posted by rnvinc
Correct ... Orientation on the Earth surface is the function of the added magnetic compass in the AS GPS HS antenna ...Quote:
Originally Posted by jaxsprat
Rickie
Will this AS GPS HS antenna take care of the donut problem when moving less than .06 mph on a older 798 combo? Or was it a software issue?
Yeah when you add the compass you never lose your heading line. Pretty sweet especially when using a chart and fishing structure.
It wasn't a software fix for the problem, but the software release must be high enough to support the HS GPS.... I don't remember what software release started support for it....Maybe Rickie will check in and know that.Quote:
Originally Posted by Fishfryed
AS GPS HS antenna requires a minimum 6.570 ...Quote:
Originally Posted by BobB
https://www.google.com/url?q=http://...Ye6HNw078Z2iig
Rickie
I used these cables that I made up a couple of years ago that Humminbird Greg helped me with to get antenna from the other internal sonar unit. It works just fine I was able to find my fish structure so that is all I needed.
https://us-mg6.mail.yahoo.com/ya/dow...ppid=yahoomail
Not sure about your unit, however on my 899 CI HD SI I can go into set-up menu and tell the head unit how far the transducer is from the head unit on the x, y, and z axis. Front to back, side to side, and vertical difference. The head unit then compensates for that difference between the internal GPS and the transducer. Essentially putting the GPS on top of the transducer mathematically so you can get back to the exact spot you marked. Well, within the margin of error in GPS.
The only advantage to the puck GPS is the magnetic compass, and it's value is for speeds less than 1mph.
Correct again Rickie the GR16 was 16 channels as they have 50 in the current models IIRC.Quote:
Originally Posted by rnvinc
ONIX - 34.