Manufacturer: Simrad

Model Number: J300X

MPN: 22081830

Listed Item Condition: Used

Additional Notes:

For Sale: J300x Course Computer – Fully Tested and Guaranteed

This J300x course computer is in excellent used working condition and has been fully bench-tested to ensure performance. Testing includes:
✔️ Both NMEA 0183 Inputs & Outputs
✔️ Rudder and Heading Inputs
✔️ Controller Communication
✔️ Motor Outputs

Important Installation Note:
When installing a new-to-you autopilot junction box, it’s essential to perform a factory reset and complete dockside setup to configure the unit for your specific vessel.

Please note:

The autopilot display is not included.

Photos show the actual unit in operation — we do not use stock images.

Tested with a Furuno VX2 (not included) to verify NMEA functionality.

The autopilot screen (not included) confirms AP engagement, and the Standby screen shows active rudder and compass response.

This listing is for the J300x course computer only — it is not a complete autopilot system. Additional components will be required for a full setup.

Compatibility:
Fully compatible with AP20, AP21, AP22, AP35, AP11, and AP3000x systems. It can also replace the J3000x, offering enhanced durability with an additional NMEA input/output and higher current handling for motor drive.

✅ Guaranteed to work on arrival – ideal for replacing a failed J300x or J3000x and getting back on the water fast.

Please review the photos for actual item condition. As a used item, some signs of wear are expected.

Thanks for looking – feel free to reach out with questions!

What’s Included:

• Simrad J300X Autopilot Computer

Compatible Parts:

This is compatible with AP20, AP21, Ap35, and AP22 control heads, as well as the AP3000x and AP11 systems.

Dimensions (L x W x H): 8 x 12 x 3 in, Weight: 4 lbs

Shipping Info: Free shipping applies to items being delivered within the contiguous United States (lower 48). HI, AK, PR, and all other US Territories, and International locations will have shipping calculated during checkout.

Return Info: 30-Day Returns

Warranty Info: 90-Day Warranty

Terms:

All items sold at Max Marine Electronics come as you see in the pictures provided, with only the parts and accessories stated in the description section named “What’s Included”. IF YOU DO NOT SEE SOMETHING YOU EXPECT TO BE INCLUDED IN THE DESCRIPTION WE PROVIDE, IT WILL NOT BE INCLUDED. Read all descriptions thoroughly. There are times when a display is used only to show the item being sold is functional and working properly. In this case, these displays are not included. If you have any questions feel free to send a message or call Max Marine Electronics Inc, Pompano Beach, Florida. We always want to be transparent with our customers and fully disclose any information regarding the products we sell.