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Product manuals and user guides for the Garmin GPSMAP-421s can be found below. You can download the selected manual by simply clicking on the coversheet or Manual. View the manual for the Garmin GPSMAP 421s here, for free. This manual comes under the category Navigators and has been rated by 16 people with an Your GPSMAP 400/500 series chartplotter must be properly installed according to the following instructions. You need the appropriate. Garmin GPSMAP 421/421s manual content summary: · 1. Insert the rubber washer (H) and the plastic spacer (G) into the transducer · 2. Route the power/data cable View online or download Garmin GPSMAP 421s Owner's Manual. Technical Reference, Installation Instructions Manual, Reference Manual, Template Manual, GPSMAP 400/500 Series Owner's Manual i. Introduction. Introduction. This manual includes information for the following products: GPSMAP® 421/421s. Garmin hereby grants permission to download a single copy of this manual GPSMAP 421/421s Select Setup to set speed, track control, and position.GPSMAP 421s - read user manual online or download in PDF format. Pages in total: 84.