Online convertors, remember to make it backwards. |00 00 38 42| would be 42380000 = 46 (the speed of our fast Mark 14 torpedo!)
http://babbage.cs.qc.edu/IEEE-754/32bit.html Hex single point IEEE format to decimal
http://babbage.cs.qc.edu/IEEE-754/Decimal.html decimal to Hex single point IEEE format.
It is a goofy format, I barely remember why from Computer Science class. Its format uses a coded mantissa and exponent to make more effecient calculations. Not a true hex number per sey. You can also represent those odd numbers like -9, or stuff like 0.00345 or 3.141526 E^6 power using this format.