Waterproof cases & mounting hardware
To protect your iPhone, iPad, or Android phone on the water, we highly recommend the cases from LifeProof. Their hard-sided cases are rugged and can be attached to your boat using their new LifeActiv line of accessories. LifeProof also makes cases for several popular Android phones.
For more information about mounting options using the LifeActiv accessories, and pictures of the mounting hardware in real use, see our blog post on this topic.
For Windows Phones, something like the AquaPac case is probably your best bet.
XGPS External GPS receiver from Dual Corporation
Starting with version 4.50, CrewNerd supports the XGPS 150/160 external GPS receivers from Dual Corporation. These GPS receivers can deliver up to 10 location readings per second to CrewNerd, resulting in smoother, more accurate pace readings that respond much more quickly to your speed changes than the internal GPS unit in your phone. They’re also a great way to extend the battery life of your phone since the internal GPS receiver can be turned off when an XGPS unit is in use.
Wahoo TICKR Heart Rate Monitor
Starting with the iPhone 4s, the new Bluetooth Smart support allows you to monitor your heart rate using only your phone and a compatible chest strap, such as the Wahoo TICKR Heart Rate Monitor. Combine this with the LifeProof case for a great, waterproof combination. This monitor also works with CrewNerd on Android version 4.3 or newer.
Zephyr HxM BT Heart Rate Monitor
For Windows Phone users or older (pre-4.3) Android devices, the Zephyr HxM BT Heart Rate Monitor allows you to monitor your heart rate over a regular Bluetooth connection. This works with any Windows Phone 8 device.