Lars Thrane LT-4100 Certus 100 Satellite Communications System

From: $3,699.00

Iridium Certus is the fastest L-Band satellite service available, the only 100% global satellite network, and supported with the lightest, smallest, and most power efficient satellite terminals on the market.   The Lars Thrane LT-4100 is the smallest Certus terminal on the market, with a compact antenna.

When paired with an Optimizer and a 10MB or 25MB monthly plan, this package makes an awesome upgrade from an Iridium Go, Iridium Handheld, or Redport Glow for those looking for much faster email and weather downloadand better voice quality while utilizing a compact antenna and maintaining low monthly costs.


  • Global Satellite Internet Terminal
  • Download Speeds to 88 kbps
  • Upload Speeds to 22 kbps
  • 100% Global Coverage
  • Solid State, No Moving Parts
  • 2 Phone Lines
  • SIP/VOIP, 1 x Data/VOIP-Phone Ports
  • High Performance GPS/GNSS Receiver
  • Prepped for Iridium GMDSS

50FT Coax Cable with TNC-M connectors for Certus 100 and 200 Systems

50FT Coax Cable with TNC-M connectors for Thales VesseLink 200

Lars Thrane LT-3100/4100/4200 Flush Mount

Lars Thrane A/S LT-3100/4100 Flush Mount

Redport Optimizer WXA-223

  • Redport Optimizer WXA-223 (new for 2023) (same functionality as WXA-203 and WXA-213 models but with newer processors and updated simplfied GUI)
  • (NEW) Make satellite phone calls with your smartphone over WiFi!
  • New: Optimizer features a Services Center dashboard to help you easily access and control your network, and a Quick Whitelist feature that lets you whitelist or block access to popular messaging apps including: Facebook Messenger, Instagram Messages, Signal, Timezero, Viber, WeChat and WhatsApp, with a single button.
  • Control your airtime usage
  • Enable satellite optimized email, weather, blogging, tracking, and more!
  • Compatible with CruisersEmail, Xgate, PredictWind, Sailblogs, Wordpress

PredictWind Datahub

DataHub by PredictWind

GPS Tracking, PredictWind vessel Polars generation, NMEA over WiFi, AIS Feed, Remote Support, Datalogging, and more!

The perfect solution for vessel tracking via Go! Exec, Certus, Fleet One, Starlink, VSAT, and other broadband Internet connections!

Connects to your vessels Internet and NMEA2000 or NMEA0183 network


Communications At Sea

The LT-4100 Satellite Communications System, from Lars Thrane A/S, is a maritime satellite communication product that operates on the Iridium® satellite network using Iridium Certus® 100 services. The LT-4100 system is designed for the professional market (deep sea, fishing, and workboats), but can be used for the leisure markets as well. It’s built for the demanding and rough environment at sea and with an operational temperature range from -40 to +55⁰C (-40 to +131⁰F) and all standards and certification requirements needed for worldwide maritime satellite communication equipment. More than 40 years of experience have been put into the design and construction of the LT-4100 system, with an exceptional performance and specification level.

A Single Antenna Cable Solution

A single coaxial cable connects the control unit with the antenna unit. Using a standard coaxial cable, up to 500 meters of separation between the units can be obtained, giving freedom to mount the antenna unit in the best possible location, with free line of sight to the satellites

Key Features:

Easy to Install

Everything is included in the box to get started with the installation and operating the LT-4100 system

IP Data and Management

22 kbps (up) / 88 kbps (down) and data management like configuration of outgoing firewall, port forwarding

Single Antenna Cable Solution

Up to 500m


POTS via Analogue Telephone Adaptors (ATA)

LAN Interface

Ethernet LAN interface on control unit

Voice Prompt Audio Feedback

Screen: Large 4.3″ TFT Display Supporting Brightness Adjustment and Day/Night Modes



Includes Bracket Mount (91-100771)

Optional Flush Mount (91-100772)

Optional Antenna Pole Mount: 91-102550

Antenna Coax Cable Not Included

Additional information

Weight 20 lbs
Dimensions 20 × 10 × 10 in

Lars Thrane


Iridium Certus

Lars Thrane LT-3100/4100/4200 Flush Mount


Lars Thrane

Redport Optimizer WXA-223



Iridium Certus 100 Airtime