Davis Quick Reference Coastwise Piloting Card [126] Outdoor | Knives The TLM100 has an optional

The TLM100 has an optional airlock for black water applications to keep the face of the ultrasonic transmitter from fouling

Digital Control: Yes

Russian Glonass and Asian QZSS)

100% WaterProof

Davis Quick Reference Coastwise Piloting Card [126] Outdoor | Knives The TLM100 has an optionalQuick Reference Coastwise Piloting Card All the piloting information you need at your fingertips: dead reckoning basics, true and magnetic compass relationships, position finding, estimating distance off, and current and leeway corrections. Helpful hints on chart reading, preparations, checklists, fog navigation, and depth soundings without a fathometer. Includes time, distance & speed calculator, relative bearing gauge for length off calculations,