Sonars are noticeably more expensive with map downloads, so the lack of a download can hardly be considered a disadvantage. In addition, there is not much trust in other people's cards, as individual, even large, stones are fixed on the screen, but will not be displayed in the final map. The echo sounder will "record" only the depths around the rocks. And the stones themselves need to be displayed manually with labels. Label names are inconvenient (cumbersome) to enter. Noticeably more confident "keeps depth" at a frequency of 200 kHz.
Deeper PRO Smart Sonar - Portable WiFi Fish Finder for Kayaks, Boats, and Ice Fishing on Shore
120 Review
Portable WiFi Fish Finder with GPS for Kayaks, Boats, and Ice Fishing - Deeper PRO+ Smart Sonar for Deeper Insights
153 Review
8 Inch Blue Injection Molded Cone Car Vehicle Subwoofer Audio Speaker - Chrome-Plated Steel Basket, Dual Voice Coil, 4 Ohm Impedance, 600 Watt Power - Pyle PLBW84 for Improved Vehicle Stereo Sound System
11 Review
π€ Prospec Electronics JBL-PRV175: AM/FM/Bluetooth/USB Marine Stereo β 4x45 Watts of High-Quality Sound
10 Review
πΊοΈ CARRVAS GPS Navigation System for Car, 2021 MAP 7inch Truck GPS Navigation, Spoken Turn-by-Turn Directions, Speed Warning, USA, Canada, Mexico, Lifetime Maps Update
9 Review
π©οΈ Stratux ADS-B Dual Band Receiver: Advanced Aviation Weather and Traffic System with WAAS GPS, AHRS, Battery Pack, Suction Mount, Antennas, SDR
9 Review
π§ FARO Aviation Headset Converter: Low to High Impedance Adapter for General Aviation (GA) and Military Headsets
9 Review
ASA HS-1 Aviation Headset: Elevating Communication and Safety in the Skies
8 Review