The best replacement for rcx3 is rcx5.

The best alternatives to rcx3 are rated as following:
★★★★★  rcx5
★★★★  ft60
★★★★  rc3
★★★  rs300x
★★  rc3 gps
★  suunto m5
★  ft40
★  polar rc3
  rs300
  polar ft60

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rcx3
rcx5
ft60