Travel eSIM ReviewsNew Zealand Interislander Ferry WiFi& Connectivity Review
Quick Answer:
New Zealand Interislander Ferry scores 4/10 for connectivity. Onboard WiFi: 10 Mbps (intermittent). Cellular coverage: poor (5 Mbps avg).Limited connectivity mid-crossing. Download South Island maps before boarding.
Onboard WiFi
WiFi: intermittent
Reliability
intermittent
Speed
10 Mbps
Cellular
Cellular Coverage: poor
Average 5 Mbps via eSIM.
eSIM vs WiFi: Cellular (5 Mbps) is slower than onboard WiFi (10 Mbps) but may be more reliable in areas where WiFi drops.
Reliability
What Works on This Route
Works
- Maps and navigation
- Pre-downloaded content
Unreliable
- Video calls (drops in dead zones)
- Real-time photo uploads
eSIM
eSIM Recommendation
Limited connectivity mid-crossing. Download South Island maps before boarding.
Get eSIM for this route →Preparation
Download Before Boarding
- 1
Download South Island offline map
- 2
Save Picton/Marlborough Sounds info
- 3
Pre-download entertainment for crossing
- 4
Save car rental booking details
Assessment
New Zealand Interislander Ferry Connectivity Pros & Cons
Pros
- Stunning Marlborough Sounds scenery
- WiFi available (basic)
- Coverage at both ports
Cons
- Mid-crossing cellular drops
- WiFi is satellite-based and slow
- Cook Strait can be rough (seasickness)
FAQ
New Zealand Interislander Ferry Questions
01Is there WiFi on the Interislander ferry?
Yes. Satellite-based WiFi. Slow (5-10 Mbps) and intermittent. Adequate for messaging but not for video calls.
02Does cellular work on Cook Strait?
At Wellington and Picton harbors: yes. Mid-crossing: mostly no. Expect 1-2 hours with limited or no signal.
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