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Garmin GPSMAP 521 specifications
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Garmin GPSMAP 521s Sounder with Dual Frequency Transducer
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User manual Garmin GPSMAP 521s (English - 84 pages)
Garmin GPSMAP 521
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Garmin gpsmap 521s and 421s fishermen should change this settings | Garmin gpsmap 521s settings - YouTube
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