Mercury – GPS Extension Cable | 3.2-Foot CAN P Line | 84-879171T21

Overview

Sometimes the factory cable on a GPS antenna just does not reach the spot where the signal is strongest. The Mercury 84-879171T21 Extension Cable gives you a little more room to work with—just over three feet—which is often exactly what you need to get the antenna into clean sky. It’s made for boats running the 8M0024918 GPS Kit and carrying a CAN P signal, especially setups without an Auto Pilot module in the loop. Once it’s in, the system simply carries on as if the extra length had always been there.

Key Features

• 3.2-Foot Extension – Adds a short, practical length of cable for cleaner routing.
• CAN P GPS Signal – Passes the dedicated GPS line used on non-Auto Pilot systems.
• GPS Kit Match – Intended for use with the 8M0024918 GPS Kit.
• Plug-In Connectors – Uses factory ends for a direct, no-guesswork hookup.
• Stable Data Path – Keeps the GPS feed steady across the added distance.
• Flexible Cable Build – Easy to route through tight paths or narrow rigging channels.

Compatibility

• GPS Kit 8M0024918
• CAN P GPS systems
• Boats without Auto Pilot modules

Performance & Practical Benefits

This cable gives you a little freedom when the factory harness comes up short. It lets you route the antenna to a cleaner mounting point—often up on the console or near the hardtop—without pulling the system tight or forcing awkward bends. The signal stays clean, and the GPS data remains steady. It’s a simple fix that solves a common rigging issue without creating new ones.

Why Buy OEM

GPS wiring is sensitive to poor shielding and loose connectors, and Mercury’s cable avoids both problems. The factory ends lock in securely, and the cable carries the CAN P signal without introducing noise or dropouts. Aftermarket extensions often struggle with consistency over time, but the OEM piece keeps things predictable season after season.

FAQ

Q1: How can I tell if I need this extension?
If the GPS antenna won’t reach an open, clean mounting spot with the standard cable, this extension fills that gap.

Q2: Does adding this cable weaken the GPS feed?
No. The cable is built for stable CAN P communication over this length.

Q3: Can this be used on boats with Auto Pilot?
It’s meant for systems without an Auto Pilot module in the GPS chain.

Q4: Will it fit narrow rigging routes?
Yes. The cable is slim and flexible, making it easy to weave through tight spaces.

Q5: Does the system need any setup after adding the cable?
No. Hook it up inline and the GPS data continues normally.