How to Maintain Your RTK GNSS Receiver: Care Guide

RTK GNSS receivers combine several critical subsystems, each possessing distinct wear characteristics and specific maintenance requirements. Understanding these subsystems is the foundation of preventative care.

• Lithium Battery: Degrades faster with poor charge management, regardless of how rugged the exterior housing is. Chemical degradation is irreversible.
• Sealed Connector Ports: IP67/IK08 ratings protect against ingress when sealed securely, but degrade rapidly if rubber covers are left open, stretched, or physically damaged.
• Antenna and Internal Electronics: Generally maintenance-free but highly sensitive to physical impact. Even slight internal dislodgement can compromise signal tracking.
• Firmware: Needs periodic updates to maintain compatibility with evolving CORS networks and satellite correction formats. Neglected firmware can lead to a failure in establishing a reliable Fixed solution.

The Economic Case for Maintenance: A GNSS receiver, such as the AP20 or AP80 Pro, represents a multi-year capital investment for a surveying firm. The preventative habits detailed in this guide cost minutes per week and require zero budget. The alternative is unplanned downtime mid-project, corrupted survey data necessitating rework, and earlier-than-necessary replacement costs.

Battery mismanagement is the leading cause of premature hardware retirement in GNSS surveying. Lithium-ion cells undergo unavoidable chemical ageing, but operating habits dictate the speed of that degradation.

Daily and Weekly Use Protocols

Charge the battery fully before each field day to ensure maximum operational runtime. Crucially, avoid letting the battery sit at 0% for extended periods. Deep discharge accelerates capacity loss in lithium batteries, causing structural stress to the internal chemistry. Partial charge cycles (charging from 30% to 90% rather than always running to empty) are significantly gentler on the battery than repeated full discharge cycles. Modern units like the AP10 and AP40 Laser+ manage power draw efficiently, but operators must manage the charging habits.

Long-Term Storage (Over 2-3 Weeks Unused)

Do not store the battery fully charged or fully discharged. Charge or discharge the unit to approximately 40-60% before extended storage — this range minimises chemical stress on the cells while preventing dangerous deep discharge during the storage period. Store the receiver in a cool, dry location between 0-20°C where possible. Check the charge level every 2-3 months during long storage periods and top up if it has dropped below 40%.

Managing Temperature Extremes

Avoid leaving the receiver and battery in a vehicle parked in direct sun in hot climates — interior temperatures can exceed 50-60°C, accelerating battery degradation exponentially even when the unit is powered off. Similarly, avoid storing batteries in freezing conditions. High-capacity base stations, like the MAX5, require the same strict temperature discipline despite their larger 13,200mAh reserves.

Before Extended Field Deployment

Always check battery health and the baseline charge level before mobilising to a remote project where charging facilities may be limited or entirely absent. A battery that has degraded significantly will show reduced runtime under standard load — note this during routine office checks rather than discovering the limitation mid-project.

Physical ports are the most vulnerable external point on any surveying instrument. Understanding how to manage these interfaces is critical for longevity.

Why IP67 Rating Does Not Mean Maintenance-Free

An IP67 rating protects against dust ingress and temporary immersion only when ports are properly sealed with their covers securely closed. The rating does not protect against damage from leaving a port open in dusty or wet conditions, nor does it prevent dirt, salt, and moisture from building up around an open connector before it is eventually closed.

Daily Field Habits

• Seal Ports Immediately: Close all port covers (SIM slot, USB-C, RS232) when not actively connecting a cable. This is the single most effective protection against connector contamination.
• Post-Field Wipe Down: After working in muddy, dusty, or wet conditions, wipe down the receiver body and port covers with a damp, lint-free cloth before packing the unit away.
• Mechanical Sympathy: Never force a connector. If a USB-C or LEMO cable does not seat easily, stop immediately. Check for debris in the port with a flashlight before applying pressure, as forcing a connection will bend the internal pins.

Periodic Checks and Replacement

Inspect rubber port covers for cracking, loss of elasticity, or loose seating every few months — these covers naturally degrade with UV exposure and repeated opening over years of field service. A compromised cover defeats the IP67 rating even if the receiver housing itself remains entirely intact. Replace damaged covers immediately through your distributor rather than continuing to use a receiver with an open or loose-fitting seal.

While the GNSS board operates invisibly, the physical orientation of the receiver dictates the mathematical validity of the survey. The hardware securing the receiver requires strict attention.

Antenna and Receiver Body

The internal components are generally maintenance-free but remain sensitive to high-velocity drops and impacts despite the IK08 rating found on units like the AP20 AR and APS1. IK08 protects against typical field drops onto hard surfaces from a working height — it is not a blanket guarantee against all impact scenarios. After any significant drop or impact, always check basic functions (power on, satellite tracking, Fixed solution achievable) before relying on the unit for production survey data.

Survey Pole Bubble Calibration

The physical bubble vial on your carbon fibre pole requires periodic checking and adjustment. A misaligned bubble renders IMU tilt compensation mathematically flawed. See our pole calibration guide for the full procedure. Always verify the bubble after any drop, heavy vibration during transit, or significant seasonal temperature change.

Mounting Thread and Tribrach Integrity

Inspect the 5/8" receiver mounting thread and any tribrach adapter periodically for wear. A worn thread introduces microscopic physical play between the receiver and the pole. Over a working day, this play degrades the IMU mounting offset calibration, introducing unpredictable coordinate drift. Replace worn adapters rather than continuing to use loose-fitting hardware.

Case and Transport Accessories

Always store the pole, controller, and receiver in their designated hard-case compartments during transport. Loose equipment rolling in the back of a utility vehicle is the most common cause of catastrophic impact damage outside of active fieldwork.

Firmware serves as the operating brain of the receiver. Keeping it current ensures maximum satellite tracking efficiency and format compatibility.

Why Firmware Matters

Firmware updates address compatibility with evolving CORS network correction formats, add support for newly launched satellite signals (such as updated BeiDou or Galileo constellations), and fix known operational bugs. A receiver running outdated firmware can experience reduced Fixed solution reliability or critical compatibility problems with newer CORS infrastructure over time.

When to Update

• Before mobilising to a new, complex, or extended project — never during it.
• When a new CORS network or RTCM correction format is introduced in your primary operating region.
• When the supplier explicitly releases an update addressing a known tracking issue relevant to your workflow.

How to Update Safely

APEKS receivers support straightforward OTA (over-the-air) firmware updates from any internet connection, featuring no geo-fence restriction or dependency on a specific country's cellular network. Connect the receiver to WiFi or utilise the built-in 4G modem, check for available updates within the ApekSurv field software, and apply the update while the receiver is securely resting on a desk with at least 50% battery remaining.

Avoid Updating Mid-Project

Schedule firmware updates exclusively between projects or during planned office downtime. Initiating an update in the middle of a live survey campaign risks temporary workflow disruption — an update interruption mid-field is easily avoidable with basic scheduling discipline.

How equipment is treated when it is not generating revenue is just as vital as how it is treated in the field. Adhere strictly to the following storage durations.

Short-Term Storage (Days to a Few Weeks)

Store the unit in the supplied hard case in a dry location. Wipe off visible moisture. No special battery management is required for storage under 2-3 weeks, though maintaining a moderate charge is best practice.

Medium-Term Storage (A Few Weeks to a Few Months)

Apply the critical 40-60% battery storage rule detailed in Section 2. Store the case in a climate-stable indoor location. Strictly avoid long-term vehicle storage, direct sunlight exposure, or unheated outdoor sheds in extreme weather climates.

Long-Term Storage (Months, Between Seasonal Projects)

Check the battery charge level every 2-3 months and top up back to 50% as needed. Inspect port covers and the pole bubble before the equipment returns to active service. Do not assume equipment is instantly field-ready without a basic function check after months of total inactivity.

Before Returning to Active Service

Power the receiver on in a clear outdoor environment. Confirm satellite tracking and ensure a Fixed solution is achievable. Check the battery runtime against the expected manufacturer specification, and rigorously verify the pole bubble calibration before commencing the first production day back in the field.