Hello folks...

My buddy and I are currently upgrading the electronics on our boat. I have ordered a Lowrance 520c for the console and was going to put a 510c at the bow, however, I have an opportunity to buy a new Lowrance 522c at a great price instead of the 510c.

My question is this:

Will these two units be compatible sonar and GPS wise? (I believe they will.)

Will the internal antenna on the 522c interfere with the external antenna on the 520c or vice versa?

Is it a benefit or a problem to have basically the same unit, but one with an internal and the other with an external antenna?

Thanks for any help!!!!!

No replys yet???

Everyone must be out fishing!!  :-/

First, the 520 cannot use the internal GPS antenna of the 522.  The 520 normally comes with an external antenna, so no problem.  Now that you have an external GPS antenna, you have two options. 1.  You can continue to use the 520 and the 522 as stand alone units (using their own antennas) or 2.  you can network the two head units together by using the MNEA 2000 network cabling from Lowrance.  In this instance, both units will use the external antenna.  The 522 will detect that an external antenna is present and automatically turn off the internal antenna.