Quick answer: The Garmin GPSmap 60CSx is designed as a waterproof handheld, but the rubber gaskets age, flatten, and collect dirt. Fog behind the lens, droplets inside, or corrosion on the battery contacts means the seal has failed. Clean and inspect the gasket, lightly lubricate it with silicone grease, and replace it if it is cracked, flattened or stretched.

Signs of a Bad Gasket

• Fogging or water droplets behind the lens
• Damp or corroded battery compartment
• Rust or white residue near the seam or screws
• Random shutdowns or erratic button behavior after wet use
• Visible cracks, flat spots, nicks or hardening of the rubber

Inspecting the Seals

1. Remove batteries and the battery door.
2. Inspect the battery door seal. Look for cracks, flattening, twisting, hair, grit or sand.
3. Open the case if needed and examine the perimeter gasket and the sealing groove.
4. Run a clean fingertip along the gasket to feel for nicks.
5. Compare the gasket cross-section to a new one if available. A seal that is permanently flattened will not compress properly.

Replacement Steps

1. Carefully lift the old gasket out of its groove with a plastic tool, avoiding scratching the groove.
2. Clean the groove and mating surface with isopropyl alcohol.
3. Fit the new gasket without twisting or stretching, seating it fully along the whole path.
4. Close the case, align the halves, and tighten screws evenly in a cross pattern without over-tightening.
5. Reinstall the battery door with its seal properly seated.

[IMAGE TODO - replace with a real image] open case with gasket groove highlighted, and a worn gasket next to a new one
Alt text: Garmin GPSmap 60CSx case gasket and sealing groove

Lubrication

Apply a thin, even film of 100% silicone grease to the gasket. Do not use petroleum-based grease, which can swell and degrade rubber. Too much grease attracts dirt and can prevent a good seal; a light sheen is enough.

Testing

1. Reassemble with batteries out and run a visual check of the seam for gaps.
2. For a cautious test, place the closed unit (no batteries) in a sealed bag with a dry tissue, or briefly place it in a shallow water test only if you accept the risk.
3. Open and check for moisture on the tissue or inside the battery compartment.

Limits

Related repairs: battery terminals corrode quickly when seals leak, and screen fogging often traces back to the gasket.

Frequently Asked Questions

Unofficial repair information for educational purposes. Opening the unit may void warranty and affect water resistance. Garmin and GPSmap are trademarks of Garmin Ltd.; this site is not affiliated with Garmin.