GPS Receiver · Position & Heading
The Furuno GP-1870F is a 7 inch GPS/WAAS color chart plotter with a built-in fish finder, and the GP-1870 is the same plotter without it. The brochure presents it as a plotter for boating use, paired with C-MAP 4D charts on an SD card of up to 32 GB. The screen is a color TFT LCD with 800 x 480 pixels, and its glass is bonded to the panel to avoid fogging. Brightness is quoted as 1000 cd/m2 on the comparison page and as 900 cd/m2 in the specification table.
The receiver uses 50 GPS channels and 1 WAAS channel on L1 at 1575.42 MHz, with an internal antenna and an optional GPA-017 external antenna. SBAS support is listed for WAAS, EGNOS and MSAS, and accuracy is 2.5 m maximum for GPS and 2 m for SBAS. Memory covers 30,000 track and waypoint points, 1,000 planned routes and 5,000 quickpoints. The unit has one CAN bus port, a mini USB port for maintenance only and built-in WiFi for the C-Weather service. AIS targets can be displayed if an AIS sensor is connected.
The fish finder, fitted to the GP-1870F only, transmits at 50/200 kHz with 600 W or 1 kW, and certain transducers need the MB-1100 matching box. Display range is 5 to 1,200 m with a shift of 0 to 500 m. For bottom discrimination the sheet advises depths of 5 m to 100 m, speeds below 10 kn, and a transom or thru-hull transducer mount. It warns that the displayed bottom component may differ from the real bottom. Transducer options include 520-5MSD, 520-5PSD, 525-5PWD, 50/200-1T, 50/200-12M, 50B-6, 50B-6B and 200B-5S.
The display unit operates from -15 to +55 degrees C and has IP56 waterproofing. It runs on 12-24 VDC and draws 0.93 - 0.49 A as the GP-1870 or 1.05 - 0.53 A as the GP-1870F with a 600 W transducer. Listed weights are 1.5 kg for bracket mounting and 1.3 kg for flush mounting.
Sources: Furuno brochure GP-1870F, checked 05.10.2026
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“The RotoKey™ has a two fold function. Rotate the knob for a finely stepped zoom control. Push the knob to get full access to GP-1670/1670F controls.”
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