Amazon.com: Gomadic Hot Sync and Charge Straight USB Cable for The Garmin etrex 10 20 30 – Charge and Data Sync with The Same Cable. Built TipExchange Technology : Electronics
Amazon.com: Professional Ultra SanDisk 32GB MicroSDHC Card works with Garmin eTrex 30 GPS is custom formatted for high speed, lossless recording! Includes Standard SD Adapter. (UHS-1 Class 10 Certified 30MB/sec) : Electronics
Amazon.com: Gomadic Portable AA Battery Pack Designed for The Garmin etrex 10 20 30 - Powered by 4 X AA Batteries to Provide Emergency Charge. Built Using TipExchange Technology : Electronics