Portable navigation unit for harbor pilots

Why I particularly like the HarbourPilot Mk5

The dual-antenna heading is important. A conventional single-GNSS receiver can give you position extremely well while stationary, but heading becomes much more dependent on vessel movement and/or external heading data. With two antennas separated along the vessel's centerline, the Mk5 can independently determine heading.

And importantly, it has independent AIS. That's a significant distinction from a simple pilot-plug repeater: you're not simply displaying whatever the vessel's Class A AIS is providing.navicomdynamics.com

I'd configure it with:

• RTK/NTRIP corrections where available
• Independent AIS
• Dual GNSS antennas
• Integrated ROT
• Rugged tablet running your preferred professional pilotage/ECS software
• Pilot-plug cable as a fallback
• Spare battery/power bank
• Physical mounting/rail kit
• A second tablet or display capability if your operation warrants it

The competitor I'd seriously consider: Trelleborg CAT MAX

Trelleborg's SafePilot CAT MAX is arguably the more sophisticated unit if your work involves very large ships, tight docking, shallow water, LNG/terminal work, or extremely demanding maneuvers.

It uses two independent units—one positioning and one heading—with integrated IMU, independent AIS, RTK, and spoofing/jamming detection. Trelleborg specifies 0.01° heading precision, 0.1°/min ROT accuracy, 1 cm + 1 ppm RTK positioning, and about 18 hours battery life. The complete system weighs under 1.2 kg.www.trelleborg.com

So I'd characterize them this way:

HarbourPilot Mk5 = best "one PPU for everything"

CAT MAX = best if maximum docking/berthing precision is the overriding consideration

One particularly interesting newcomer

Navicom's ChannelPilot X is worth watching. It is designed specifically around your use case: different vessels with different sensor arrangements.

It has three modes:

• Autonomous/Class A: completely independent position, heading, ROT and AIS
• Supported/Class B: independent position/ROT but uses vessel AIS heading
• Dependent/Class C: uses pilot-plug vessel data while retaining independent ROT

It supports GPS/GLONASS/Galileo/QZSS/BeiDou, L1/L2/L5/L6, RTK, integrated AIS, Wi-Fi/cellular and multiple connected displays. However, Navicom currently says commercial availability is Q2 2027, with demo units expected from December 2026.navicomdynamics.com+2

That's almost exactly the architecture I'd want for a pilot who boards containerships, tankers, bulkers, LNG carriers, car carriers, tugs, etc.

One important caution

I would not buy a PPU solely because it advertises centimeter-level GNSS accuracy. For pilotage, the quality of heading, ROT, antenna geometry, sensor filtering, AIS independence, mounting repeatability, and the software's handling of degraded GNSS can matter more than the headline positioning number.

A pilot-plug-only unit is particularly vulnerable to bad or questionable shipboard sensor data. Industry guidance specifically points out that the pilot may not know the origin or accuracy of data coming through the pilot plug.www.marine-pilots.com

If I were equipping myself personally today, I'd buy the HarbourPilot Mk5 + a good rugged iPad/Windows tablet + RTK corrections, while retaining pilot-plug connectivity as a backup. For a pilot station buying several units, I'd also put the CAT MAX through an operational trial before deciding.

If you tell me what types of vessels you pilot (container/tanker/bulk/LNG), typical draft/LOA, and whether you're mostly docking or doing channel/river transits, I can narrow this down to a specific PPU + tablet + software package and compare approximate purchase costs.