I just picked up a PMB-688 GPS module that I am going to test with this clock.
The PMS-688 costs about the same as the PMB-248, has close to the same specs as the EM-406a, plus it has a RF MMCX connector for an external antenna. This may allow the clock to time sync further from a window.
The EM-406a draws fewer mAs, but the PMS-688 and it's 65mA may be just small enough to slide under the 200mA fuse in the ICE kit.
Adafruit may consider using the PMB-688 as a replacement for the PMB-248 that is out of stock.
ICE Tube Clock GPS Mod - PMB-688
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Re: ICE Tube Clock GPS Mod - PMB-688
thanks! we're always on the lookout for replacement GPSs
Please be positive and constructive with your questions and comments.