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Just the memory card. The Helix 9 will write the data to a MATRIX folder on the card, then the Helix 8 will recognize that folder and import the data.

Also the Auto Chart Live data is read from the Zero Line card the same way with both units. Did you turn on Auto Chart with the Helix 8?

The Zero Line card has nothing to do with GPS data. GPS data is stored in the unit's memory and has to be exported to a memory card to load to other units or managed with HumminbirdPC.
Get a 32GB or...

The Quest should have the MKR-MI-1 included, just need to get the 14 M 360 2DDI Y cable.

Since the Minnkota built-in transducer has a 14-pin plug and so does the MEGA 360, you need to use the 14 M 360 2DDI Y cable.
That Y cable has two female 14-pin plugs for those transducers, it also...

The spec coverage for each side of SI is 86 degrees.
The actual SI total coverage is from the water's surface to past vertical under the transducer on both sides==180 degrees +
The spec DI coverage...

Converting Lowrance Version 5 Waypoints to GPX Format – Humminbird (johnsonoutdoors.com)

What version .usr is it? Has to be usr4 or less for HBPC to recognize.

You may have to convert .usr to GPX to get it to load to HBPC

This is the same fish on 2D and DI

https://i.postimg.cc/SN4bFf4N/S00024.png

The spec coverage is different between 2D and DI. DI is larger so stuff can be displayed on DI and not 2D.
A Down Imaging unit's transducer has two piezos--one for 2D and the other for DI, they are...

It does somewhat to display the Spotlock waypoint on the Chart view, MEGA 360 view, and MEGA LIVE Landscape view.

A Helix unit has to have the data in a MATRIX folder before it will load. HumminbirdPC does that AFTER you load the Lowrance data to HBPC.

You cannot use the SD card symbol with arrows to download...

There are dozens for sources for Humminbird accessories including Humminbird. Just do a web search for that model name.

The current 2D splitter cable is 9 M SIDB Y. It replaced the AS SIDB Y

This is the only reference in the installation instructions:

CAUTION! Do NOT mount the cables where the connectors could be submerged in water or flooded. If cables are installed in a...

What is the second transducer for?

:thumb up2:

Makes no difference, you have to adjust for the conditions where you are when you are there.

MEGA is a frequency range== 1.0 MHz+

Reduce the number of waypoints the units have.
Try the current AS ETH 5PGL Ethernet Switch. It is faster.

The shaft diameter is the same.

The MEGA 360 uses the unit transducer port pin locations for Side Imaging. It replaces SI with a SI+ model and adds SI to a DI+ model. It does 360 or Side Imaging,...

Start with page 45 for the spec coverages:

HELIX Series Operations Manual (widen.net)

Don't know anything about it, just know how to do a Google or Bing search for that topic.

In the unit main menu Setup tab there is a selection for Digital Readouts.
Boxes, Overlay, and Off. Overlay is the default setting.

You cannot customize the Overlay readouts.

Explain what that has to do with sonar returns.

"If you ain't scoping you are just hoping". I was hoping for a bigger fish with the 3.8" Scope Stik.

https://i.postimg.cc/FFGRn2F4/Scope-Stik.jpg